The psychosocial impact of food allergy and food hypersensitivity in children, adolescents and their families: a review

Authors


  • Edited by: Hans-Uwe Simon

Dr. Jane Lucas, Sir Henry Wellcome Laboratories, Infection Inflammation and Immunity, Child Health (MP 803), Southampton University Hospitals NHS Trust, Tremona Road, Southampton SO16 6YD, UK.
Tel.: +44 (0)23 80 796160
Fax: +44 (0)23 80 798847
E-mail: jlucas1@soton.ac.uk

Abstract

To cite this article: Cummings AJ, Knibb RC, King RM, Lucas JS. The psychosocial impact of food allergy and food hypersensitivity in children, adolescents and their families: a review. Allergy 2010; 65: 933–945.

Abstract

Food allergy affects 6% of children but there is no cure, and strict avoidance of index allergens along with immediate access to rescue medication is the current best management. With specialist care, morbidity from food allergy in children is generally low, and mortality is very rare. However, there is strong evidence that food allergy and food hypersensitivity has an impact on psychological distress and on the quality of life (QoL) of children and adolescents, as well as their families. Until recently, the measurement of QoL in allergic children has proved difficult because of the lack of investigative tools available. New instruments for assessing QoL in food allergic children have recently been developed and validated, which should provide further insights into the problems these children encounter and will enable us to measure the effects of interventions in patients. This review examines the published impact of food allergy on affected children, adolescents and their families. It considers influences such as gender, age, disease severity, co-existing allergies and external influences, and examines how these may impact on allergy-related QoL and psychological distress including anxiety and depression. Implications of the impact are considered alongside avenues for future research.

Food allergy is an increasing problem in adults and children. The incidence has increased dramatically in recent years, with a possible doubling in the incidence of peanut allergy over 4 years (1). The severity of allergic disease also appears to be increasing as demonstrated by doubling of hospitalization for anaphylaxis over a 5-year period (2). A number of severe, life-threatening allergies that were once rare are now increasingly common, such as kiwifruit allergy in young children (3).

There is no cure or preventative treatment for food allergy at present. Therefore, management is restricted to avoidance of the implicated food via elimination diets and emergency treatment of symptoms caused by accidental ingestion, with the aid of treatment plans, which aim to reduce morbidity, mortality and improve quality of life (QoL). Morbidity is low and mortality exceedingly rare in those suffering from food allergy (4). However, the impact of food allergy on aspects of daily living and QoL, as well as emotional states such as anxiety and depression, has been shown to impact adversely on the child and family. These studies have varied in their sample characteristics, in the age of participants investigated and in the instruments used, which have included a mixture of nonvalidated and validated generic health and food allergy-specific scales (Table 1). This review examines what is currently known about the psychosocial impact of food allergy and hypersensitivity on children and their families and explores the implications of this for health and management of food hypersensitivity, whilst highlighting further avenues of research.

Table 1.   Summary of studies investigating quality of life in food allergic children and adolescents (QoL = quality of life; y = years; IDDM = insulin dependent diabetes; IBD = Inflammatory Bowel Disease)
AuthorCountryStudy populationStudy methodsStudy aimResult
Akeson et al., 2007ScotlandSeven adolescents 13–16 y, and their parents. Self-report of physician diagnosed anaphylaxisIn depth interviewExplore the psychosocial impact of living with anaphylaxis on adolescents and their parents; their management of the condition; and perceptions of health care provisionMost adolescents could not remember a severe reaction (parents had vivid recall) and reported less impact on life than parents reported. Parental anxieties included handing responsibility to child
Avery et al., 2003EnglandChildren (7–12 y), 20 peanut allergic and 20 IDDM children. Diagnosed in specialist clinicsResearcher designed questionnaires; cameras to record impact of allergy/IDDM on QoL over 24 hCompare QoL between patients with peanut allergy and IDDMAllergic children had more fear of adverse events, more anxiety about eating than diabetic children
Bollinger et al., 2006USACaregivers of food allergic children from 87 families. Food allergy diagnosed in specialist allergy clinicQuestionnaire to evaluated effect of food allergy on family activitiesImpact of food allergy on the daily activities of food allergic children and their familiesSignificant effect on daily family life e.g. meal preparation and family social activities
Calsbeek et al., 2002The Netherlands758 adolescents and young adults (12–25 y) with chronic digestive disorders including IBD and coeliac disease, chronic liver disease. 98 had food allergy. Population-based control group (n = 306)Postal self-report questionnaire to measure friendships, partners, leisure activities, education, financial situationInvestigate consequences of having a chronic digestive disorder (including food allergy) on the social position of adolescentsFood allergic group had higher rate of absence from school compared to controls but social position was less affected than those with IBD or liver disease
Calsbeek et al., 2006The Netherlands758 adolescents and young adults (12–25 y) with chronic digestive disorders including IBD and coeliac disease, chronic liver disease. 98 had food allergy. Population-based control group (n = 306)Postal self-report questionnaire to measure burden of disease such as physical complaints, hospitalisation, use of medication and school and leisure activities, going out and friendships. Hospital Anxiety and Depression Scale (HADS)Describe the nature of the burden of disease in those with chronic digestive disorders (including food allergy). Determine whether burden of disease is associated with difficulties in school and leisure activitiesFood allergy group experienced a greater burden of disease compared to the control group, particularly for physical complaints
Calsbeek et al., 2006The Netherlands622 young adults (15–24 y) with chronic digestive disorders including IBD, coeliac disease, chronic liver disease. 77 had food allergy. Population-based control group and national statisticsPostal self-report questionnaire to measure burden of disease such as physical complaints, hospitalisation, use of medication. Labour participation was measured by number of hours employed per week. Hospital Anxiety and Depression Scale (HADS)To compare disease burden and employment status in young adults with chronic digestive disorders (including food allergy) with healthy controlsFood allergy group experienced a greater disease burden compared to control group and a higher percentage of those with food allergy, IBD and chronic liver disease did not participate in the labour market
Cummings et al. 2009England41 peanut and nut allergic children, and their mothers. Diagnosed in specialist clinicPostal questionnaire to assess maternal and children’s QoL (PedsQLTM, WHOQOL-BREF, FAQL-PB), anxiety (SCAS, STAI) and perceived stress scale (PSS). Children also completed a nut allergy-specific QoL questionnaireTo investigate the impact of nut allergy on QoL and anxiety in mothers and children with nut allergy to identify management strategies that may influence these factorsMother and child reported lower anxiety when the child was prescribed an epinephrine auto-injector. Anxiety was not associated with whether the child carried the auto-injector or whether they strictly avoided traces of nuts in foods
Gillespie et al., 2007Canada6 mothers of 6- to 12-year-olds considered at risk of anaphylaxis and carrying adrenaline. Risk diagnosed by private clinic allergist or parent was member of support groupSemi-structured interviewsUnderstand the mother’s experience of parenting a child at risk of anaphylaxisThe feeling of ‘living with risk’ was predominant. Risks were said to evolve from different people and environments as well as foods and experiences. Once mothers understood the risks, they described an emerging feeling of ‘living with fear’ including fear for risk to life, fear following diagnosis, fear for the present and future, and fear as their child’s world develops
King et al., 2009England46 families with a child with peanut allergy, which included mother, father and an older sibling all with no history of food allergySelf-report validated scales to measure QoL, (Peds-QL; WHOQOL-BREF), anxiety (SCAS, STAI), stress (PSS) and study-specific questionnaireEstablish impact of peanut allergy on QoL, anxiety and stress in children with peanut allergy, their parents and siblingsMothers had worse psychological and physical QoL and higher anxiety and stress than fathers. Children with peanut allergy had poorer QoL than siblings. Mothers rated greater impact on QoL for their allergic child than the child rated themselves
Lyons & Forde, 2004England162 adolescences (15–20 y) attending a university psychology open day. 24 (15%) had self-reported food allergyStudy-specific questionnaires, State Trait Anxiety Inventory (STA) and Perceived Health Competence Scale (Smith 1995)To measure differences in awareness and perceptions of food allergy and anxiety between young people with and without food allergyThose with allergy reported their allergy has less impact on their lives than others believed it would. Those with perceived allergy and high health competence reported greatest anxiety levels
Mandell et al., 2005CanadaParents of 17 children with peanut allergy and anaphylaxisQualitative semi-structured interviews to investigate experiences adjusting to diagnosis of anaphylaxis and life thereafter, and sources of information and supportInvestigate the experience and needs of families coping with life-threatening allergies in a childLack of information at diagnosis increases anxiety and uncertainty in how to manage risk and safety for their child. Mothers felt inadequately supported in bearing the responsibility for their child. Potential interventions recommended
Marklund et al., 2004Sweden1488 adolescents (13–21 y), 271 (19%) with self-reported food hypersensitivityStudy-specific questionnaire and generic health-related QoL questionnaire (SF-36)Investigate effect of allergies, particularly food, on QoL in adolescentsPerceived food hypersensitivity was associated with poor health-related QOL, whether or not the diagnosis was made by a physician. Females reported more food hypersensitivity and lower QoL than males
Marklund et al., 2006Sweden134 parents of 8- to 19-year-olds with parent-reported food hypersensitivityGeneric health-related QoL (child and family) questionnaire (CHQ-PF28) and study-specific questionnaire relating to food hypersensitivityInvestigate parent-reported health-related QoL in families of children considered to be food hypersensitiveWorse physical health-related QoL was associated with co-existing atopic diseases. Boys were perceived to have lower physical QoL than girls
Marklund et al., 2007Sweden17 adolescents (14–18 y) with exclusion diets at school for food hypersensitivity (not necessarily under medical supervision)Focus groupsInvestigate the experiences of being a food-hypersensitive adolescentAdolescents strive to normalize their experiences and tone down negative experiences. Some expressed insecurity and frustration
Ostblom et al., 2008SwedenParents of 1378 children aged 9 y from a population-based birth cohort; 212 children had food hypersensitivityGeneric health questionnaire (CHQ-PF28) and disease-specific questionsInvestigate impact of food hypersensitivity on health-related QoL in childrenChildren with food hypersensitivity had lower scores for physical functioning and role/social limitations than those without. Children with food-related lower airways symptoms had lower scores for self-esteem, family cohesion and parental impact of time
Primeau et al., 2000Canada153 peanut allergic children (<18 y), 37 peanut allergic adults (18–45 y). 76% diagnosed by specialist allergy clinics. Remainder recruited from support organisation and media. Compared to group with rheumatological diseaseVisual analogue scale adapted from European QoL questionnaire (EuroQoL-5D); Impact on Family questionnaire (IFQ); Child Health Questionnaire (CHQ) or generic health questionnaire (SF-36); asthma severity questionnaire; study questionnaire for food allergy detailsCompare QoL and family relations of adults and children with food allergy and people with rheumatalogical diseaseFor children with food allergy, there was more disruption of daily activities and impairment in the familial-social dimension of IFQ compared to children with rheumatological disease. Adults with rheumatological disease reported more family disruption than adults with peanut allergy
Sicherer et al., 2001USA253 parents of food hypersensitive children (5–18 y) belonging to Food Allergy and Anaphylaxis Network with self-reported allergy (96% under specialist allergy care) compared to population normsChildren’s Generic Health Questionnaire (CHQ-PF50) and study-specific allergy-related questionnaireInvestigate parental perception of health-related QOL in food hypersensitive childrenScores were worse in study cohort than norms for general health perception, parental distress and worry, and interruptions and limitations in usual family activities

The following databases were searched for studies published in English from 1990 to 2009: PubMed, Medline, PsycInfo, Cinahl and Web of Science. The following search terms were used: food allergy, food hypersensitivity, food intolerance, adverse food reaction, exclusion diet, elimination diet, quality of life, well-being, daily activities, psychological distress, anxiety, depression, allergic reactions, anaphylactic reactions and gender. Articles were examined by all authors of this review for relevance. The term food hypersensitivity in this review is used to refer to allergic and nonallergic hypersensitivity and food intolerance. Food allergy is only used to refer to conditions where there is verified immunologic aetiology (5). When referring to specific studies for clarity, this review uses the terminology reported by the authors of those studies.

Impact of food hypersensitivity on QoL of the patient

Quality of life studies have highlighted the subjective nature of living with an illness, where emotional, social and cognitive factors, in addition to expectations and coping style, influence personal perception (6, 7). Health-related QoL considers the effects of an illness and its treatment upon the patient, as perceived by the patient, looking at social, psychological and physical states. In a healthcare system where a patient centred approach is now favoured, QoL research in patients with allergy can provide means for improving the management, care and experiences of patients and families.

Few studies have directly assessed the impact of food allergy on the QoL of the patient using specific QoL scales rather than generic health scales. Those that have consistently report that food allergy has a detrimental impact on aspects of QoL. In the first study to directly ask children to report on their own QoL, Avery et al. used a food allergy-specific (unvalidated) QoL scale and found that children with peanut allergy reported lower QoL scores than children with insulin dependent diabetes mellitus (IDDM) (8). Quality of life of management of the condition and eating were particularly important in children with peanut allergy, who were more afraid of accidentally eating peanuts than children with IDDM were of having a hypoglycaemic event. In a study using validated generic QoL scales, children with peanut allergy reported significantly poorer QoL than their healthy siblings (9). This was particularly the case for physical QoL, QoL in school and overall QoL. They also reported poorer emotional QoL and psychosocial health than the norm means published for the scale (9). However, both studies used a small number of participants recruited from clinic, suffering from peanut allergy only and so may not be generalizable to a nonclinic-based population suffering from a wider range of food allergies.

Clearly, more work is needed in this area, using validated food allergy-specific QoL scales, which are now available, to more fully explore the impact of a range of food allergies in both clinic- and nonclinic-based populations. Generic QoL scales are also particularly useful when comparing patient populations with healthy controls, and future studies should consider using both types of measures.

Affect of food hypersensitivity on general health and daily life

Many studies have not used QoL scales but have asked caregivers or patients about the impact of food hypersensitivity on their general health and on family and daily life. These studies, alongside those using more specific or validated scales, have found that food allergy can have a significant impact on a wide variety of daily activities.

Affect of food hypersensitivity on general health aspects of QoL

The impact of food allergy on general health aspects of QoL appears equivocal. Lyons et al. described that a cohort of 24 food allergic or intolerant individuals aged 15–20 considered themselves as healthy as their peers (10). However, it is worth noting that the study did not distinguish between allergy and intolerance and involved mainly females. Sicherer et al. (11) found that parental perception of general health were significantly decreased if their children had food allergy compared to healthy general population norms. Similarly, Ostblom et al. (12) found that parents of 9-year-old children with food hypersensitivity reported that their child had significantly worse physical functioning, more social limitations and poorer general health than children with nonfood-related allergic diseases and children with no allergic diseases. Those with high levels of food-specific IgE-antibodies also had poorer mental health and general health.

When asking the children themselves, King et al. (9) found that children with peanut allergy reported a greater impact on physical health aspects of QoL than their siblings. However, this was only in females with peanut allergy. Using a much larger study sample (n = 1488) recruited through schools in Sweden, Marklund (13) asked adolescents aged 13–21 years to complete a generic health survey (the SF-36) and a study-specific questionnaire. They reported that adolescents with allergy-like conditions scored lower on seven of the eight SF-36 scales than those with no allergy-like conditions. In addition, females with food hypersensitivity scored significantly lower on three of the health scales compared to females with no other allergy-like conditions. There were no such differences in males however. There therefore appears to be gender effects in the perception of the impact on health. This is discussed more fully in the following paragraphs and should be considered in the analysis of future studies of QoL in food hypersensitivity.

Activities within the family

A number of studies have reported that activities undertaken as a family unit are limited by having a food allergic child (11). Primeau et al. (14) compared adults and children with nut allergy to those with rheumatological disease using the Impact on Family Questionnaire and found that parents of children with nut allergy reported more disruption to daily activities and more family disruption as a direct consequence of the nut allergy. Bollinger et al. (15) investigated the caregiver’s perspective of the impact of a child’s food allergy on different aspects of daily life. Disrupted activities included family social events, field trips, parties, sleepovers and playing at friends’ houses. Half of families reported significant disruption to these aspects of their lives. Many parents would rather minimize the risk and anxiety induced by such activities by avoiding them altogether (15), and parents report preventing their child from attending parties and school trips (14). Children also report anxiety in regards to going on holidays, attending parties and using public transport (8). Everyday activities such as shopping and eating out are frightening for children with food allergy and even perceived as life threatening. The restrictions that food hypersensitivity places upon an individuals’ social activities is supported by the fact that following a negative food challenge, the social life of the child and family has been shown to significantly improve (16).

Many parents find it difficult separating from their child (15). As a result, parents with allergic children often accompany them in social situations beyond the age at which nonallergic children are accompanied. Although this hypervigilance is imposed by parents, they themselves express concern over the effect that such increased protectiveness will have on their child (17). This overprotection can extend beyond childhood. For example, food allergic young adults (aged 18–22 years) who had experienced anaphylaxis rated their parents as more overprotective than food allergic young adults who had never experienced anaphylaxis (18).

Eating outside the home

Food allergy is the primary cause of anaphylaxis within the outpatient community setting, and its prevalence is increasing (2). A study of over 200 cases of anaphylactic reactions in the UK showed that most cases of food-induced anaphylaxis occur outside the home (19). It was reported that 25% have occurred whilst dining at restaurants and 15% occurred whilst at school or work. In another study of fatalities because of food-induced anaphylaxis, 20 out of 31 people experienced their reaction away from the home environment (20). Locations included restaurants, schools, work and friends’ houses. Similarly, a more recent study in the UK found that most fatalities were outside of the home such as work, school or nursery, restaurants and at camp (4).

Many food allergic children and their families will go to the same restaurants repetitively as they cater for those with allergies (8). Reactions in restaurants are usually a result of cross contamination or unexpected ingredients, particularly in desserts or Asian foods (21). In most cases of allergic reactions at restaurants, individuals believed the food they were eating to be safe (22). Peanuts and tree nuts are common ingredients of Asian, Chinese and Mexican cookery (23) and families need to be aware of the potential risks of eating takeaways as well as in restaurants.

School

Concerns regarding disease management at school have been raised by allergic individuals (8). Parents worry as they are not present whilst their child is at school, to prevent allergen exposure and treat any potential reactions. These concerns may be found, as in a UK study of self-reported food-induced anaphylactic reactions, nearly 20% of those affecting children reportedly occurred whilst at school (24). More than 30% of parents of children with food allergies make more than one visit per month to their children’s school to discuss issues surrounding their child’s allergy (11). However, despite parent’s concerns, proportionately fewer reactions occur in school than other nonhome situations, considering the amount of time spent there.

Food hypersensitivity can affect the school attendance of the child. One-third of respondents to a USA study reported a significant impact on their child’s school attendance, and 10% of the study group home-schooled because of their food allergy (15). Similarly, in two studies conducted in the Netherlands, a higher absence from school was reported for those with food allergy compared to healthy controls, possibly because of the greater disease burden reported by those with food allergy (25, 26). This extended to early adulthood with a lower percentage of young adults with food allergy in full-time work compared to health controls (27). Education, awareness and training of school personnel are necessary to reduce parental anxieties and to prevent attendance being affected as a result and management plans should be established at all schools.

It is not just children who are affected whilst in educational establishments. Those aged 18–21, still in education and living with food allergy, felt that wider selections of safe meal options, allergen-safe cafeteria areas and selected members of staff to discuss meals with would improve their experience of living with food allergy; 68% stated that education of other students would improve and ease their ability to live with food allergy (28).

Effect of gender and age on QoL

In relation to general allergic conditions, adolescent girls have been reported to have significantly lower scores in the majority of health-related QoL areas than boys (29). Girls with food hypersensitivity also scored lower on general health, bodily pain and social functioning compared to girls with nonfood allergies (29). King et al. (9) also found that girls with peanut allergy reported significantly greater impact on QoL compared to female siblings, particularly for QoL in school, physical health-related QoL and overall QoL. Boys with peanut allergy only rated QoL in school as significantly worse than male siblings. It may be that boys try to diminish the importance of their condition in an attempt to reduce stigmatization, whereas girls will integrate their condition into part of their social identity (30).

When parents are asked, rather than the children themselves, a slightly different picture emerges. In a study which included children aged 8–19 (29), parents of food hypersensitive children reported boys with food allergy to have a poorer QoL than girls in terms of physical functioning and general health, whilst girls were reported to have poorer mental health scores than boys. A number of reasons for sex and gender differences in people with food hypersensitivity have been suggested in the literature (31) including biological vulnerability, perception of symptoms, exposure to and evaluation of risk, information processing and role expectations. It is clear that the mechanisms of sex and gender differences are an important area for future study and that research assessing the impact of food hypersensitivity looks at gender differences in outcome variables.

Age is also associated with differences in the impact of food hypersensitivity. Marklund et al. (29) found that from a parent’s perspective, the younger their food allergic child, the more negative an impact their food allergy has on everyday family activities. This may reflect children outgrowing some food allergies in early childhood or simply changes in coping over time. More research into the developmental aspect of QoL in those with food hypersensitivity is needed.

External influences on QoL

Reactions of other people

Parent’s major frustrations include a lack of public understanding, unwillingness of others to accommodate, inconsistent medical information and mislabelling of products (17). The general public’s perception of food allergy impacts on the life of adolescents (10). The knowledge and perceptions of others may influence how someone’s food allergy is managed, for example, if a patient feels that their friends believe rituals such as asking about ingredients are not important, they may be less inclined to be as vigilant (10). In some cases, children can experience teasing and harassment because of their food allergy, some reportedly being smeared with the allergic food (23). Adolescents have expressed feelings of being disregarded by others and have faced unreliability and a lack of understanding from others (32). However, adolescents have also experienced and were appreciative of supportive environments (32).

The allergy management plan recommended by health professionals may influence the QoL and anxiety experienced by children and their parents. Prescribing auto-injectors is associated with reduced anxiety for nut allergic children and their mothers but is not associated with whether the child carries the auto-injector (33).

Parents have highlighted frustrations caused by hostility from others, particularly from school personnel and extended family (17). Some families have family members or friends who do not believe their child’s food allergy diagnosis (23). Parents deem the co-operation of those who care for their allergic child and the information that they provided to them key in maintaining safety (17). This allows parents to exert some control when another person takes over the responsibility of their child.

Food labelling

The vigilance required for allergen avoidance when shopping or eating out depends on information that is often hidden or misleading (34). Clear food labelling regarding allergens is essential to help allergic patients manage their allergy, although precautionary labelling can lead to unnecessary restrictions. A study by Joshi et al. (35) showed that in a group of parents avoiding peanuts, only 54% were able to correctly identify their presence on a label. This was worse for those with a milk allergy, where <10% correctly assessed the labels. Of those who scored perfectly, 90% were members of the Food Allergy and Anaphylaxis Network, and it may be that belonging to a support group enables parents to more easily access information needed to successfully manage food allergy. Parents have described how they will read labels up to three times before giving their child the food and this has been justified by parents reporting to notice the allergen only on the third attempt (23). A recent study of nut allergic children and their mothers by Cummings et al. (33), reported better allergy-specific QoL in mothers and children who reported eating products labelled ‘may contain nuts’ than those who strictly avoided all nuts.

Allergic features and their effect on QoL

Previous allergic reactions to food

It has been reported that previous and concurrent allergic experiences impact on present QoL. Bollinger et al. (15) reported that a history of an anaphylactic or severe reaction to an allergen had no deteriorative impact on families’ or individual’s QoL and that the precautions taken and potential consequences of ingestion are more influential on QoL than a serious past reaction. The authors discussed a phenomenon observed in other conditions whereby one event (such as a past reaction) does not have an overwhelming emotional impact, but the accumulation of daily frustrations and strains impact on QoL and enhance stress levels. Marklund et al. (29) also found the risk of a potential reaction and the disruption caused by measures taken to avoid allergen exposure were associated with a lower QoL, rather than the actual clinical reactivity experienced on exposure to an allergen. It was also noted that the larger the number of previous reactions to foods, the lower the parental reported physical functioning of the child, and the higher the impact upon family social activities (29).

In cases where children cannot remember having a serious or anaphylactic reaction, teenagers with food allergy have reported that anaphylaxis has a low impact on their day-to-day lives, in comparison with what their parents report (36). Conversely, it has been suggested that post-traumatic stress disorder may be triggered by experiencing or observing an anaphylactic reaction (37). It has also been suggested that children who have previously experienced a severe allergic reaction may became withdrawn and fearful, or develop disordered eating (23). This suggests that some individuals may be negatively emotionally affected by having a previous severe reaction to food.

The fact that a child has not had a recent reaction is often viewed by parents with mixed emotions. Some see it as reassuring sign that they are managing the allergy effectively, whilst others worry that it will give them and their child a false sense of security where a reaction is more likely to occur (38). This suggests that it may be down to individual characteristics and personality traits as to whether the occurrence of previous reactions will negatively or positively impact upon QoL; however, research is needed to assess this hypothesis.

Co-existing allergies

Food allergy is frequently associated with other atopic conditions including asthma, hay fever and atopic eczema. In a questionnaire-based study, Sicherer et al. (11) questioned 253 parents of 5- to 18-year-olds with food allergy, to ask about their child’s physical and psychosocial functioning. Of them, 33% had asthma and atopic dermatitis, 13% atopic dermatitis alone and 21% had neither. The study group as a whole had poor scores for general health perception, emotional impact on the parents and limitation of family activities. Those families whose child had associated asthma and atopic dermatitis scored worse for general health perception, but these co-morbidities had no effects on emotional, behavioural and family cohesion aspects of a child’s QoL. Similarly, Ganemo et al. (39) asked 78 Swedish children with eczema to complete validated dermatitis QoL scales and a Dermatitis Family Impact Questionnaire and found higher scores on family impact for those with food allergy or intolerance in addition to their eczema.

Marklund et al. (29) investigated parental reported health-related QoL of school age food hypersensitive children. They also found that co-existing atopic diseases were a significant factor contributing towards lower levels of physical health QoL and that this correlated with the number of co-existing diseases. This is interesting, as physical functioning dimensions were not reduced in those suffering from food allergy alone (29). Marklund’s study supported Sicherer’s finding that co-existent atopic eczema and asthma combined had the largest impact on general health-related QoL. They additionally found that areas of physical functioning, social timetables, bodily pain and general health were all affected by co-existing atopic disease (29). This is presumably because other allergic conditions such as asthma and hay fever are largely physical diseases with somatic symptoms. The number of co-existent allergic diseases also correlated with lower parental QoL in terms of time and emotional impact, and increased disruption to family activities. However, parents considered their child’s psychosocial QoL, including emotional impact, general behaviour, self-esteem and mental health, to be affected by their food allergy, but not by the co-existent allergic conditions. The reasons behind this were unclear. Co-existing asthma, especially if poorly controlled, forms a risk factor for fatal allergic reactions to food (22, 40, 41). Severe rhinitis is also associated with an increased risk of severe pharyngeal oedema, severe asthma with an increased risk of bronchospasm and severe eczema with a risk of unconsciousness (42). However, as discussed by Marklund et al., it is probably simply the physical impact of other atopic conditions, which are impeding QoL, rather than their potential risk of a more serious reaction. Perhaps, further qualitative work could investigate these issues in parents in more detail.

The higher the number of food allergies a child has, the higher the impact and the lower their perceived overall health-related QoL (11, 15). There is also a greater impact on family activities (29). The specific food to which a child is allergic has been reported to have no relation to the impact of an allergy on QoL (15). This is despite certain foods, for example peanuts, being particularly likely to cause severe and even fatal reactions, whilst others such as milk are particularly difficult to avoid for young children. However, much of the current research has focused on nut and peanut allergy. The impact on QoL of a broader spectrum of allergenic food types is needed.

Effect of severity and symptoms on QoL

Food-induced allergic reactions can elicit a number of different symptoms. Marklund et al. (29) found that parents of children who experience gastrointestinal symptoms as a result of allergen exposure report a higher emotional impact than for other reported symptoms. This is of importance as there are almost no medications available for gastrointestinal symptoms. Parents also perceived their food hypersensitive child to have lower physical functioning if they suffered from allergen induced breathing difficulties (29). Interestingly, however, parents of children who reacted to food with severe symptoms including breathing difficulties and anaphylaxis reported better psychosocial well-being of their children. They also reported significantly higher family cohesion compared with those with other food-induced symptoms. Perhaps, the children and parents use greater co-operation and communication to develop strategies for coping with their food hypersensitivity, involving other family members in the process; or perhaps this group of patients receives better medical support. These findings are interesting as largely benign gastrointestinal symptoms have as much of a significant impact on QoL as breathing symptoms, which are potentially life threatening. Further research into this area is required to elucidate the reasons for these research findings.

Impact of food allergy on QoL of caregivers

Caregivers for people with chronic conditions are known to suffer from greater psychological distress and poorer QoL (43–46). This has also been reported in family members of children with food hypersensitivity. Mandell et al. (17) found that all members of an allergic child’s family are significantly affected by restrictions put in place because of their child’s allergy. In some cases, it was observed that siblings avoided the allergenic food themselves (17). In some families, all members followed the allergy restricted diet; and therefore in terms of food limitations, all family members are similarly affected when compared with the allergic patient (23). Marklund et al. (29) reported on the parent’s perception of the impact of food hypersensitivity in school children. Parents of more than one child with food allergy and those with children with a higher number of allergic diseases had lower parental health-related QoL and more disruption to family activities.

In the first study to directly assess QoL using validated measures in both parents of a peanut allergic child, King et al. found mothers reported greater impact on psychological and physical QoL than fathers (9). However, both mothers and fathers reported significantly better QoL than the UK norm means for almost all QoL subscales. It is possible that the generic nature of the QoL scale used meant that it was not sensitive enough to the specific aspects of QoL that are affected by having a child with food allergy. However, the results are encouraging in that they support the idea that general QoL is not unduly affected by looking after a food allergic child. More interesting are the differences reported between mother and father, which may be because of mothers bearing more of the burden of responsibility than fathers in looking after the food allergic child.

Mothers often have the primary responsibility over their child’s food allergy, whilst fathers help rather than share the responsibilities (17). Lack of support from spouses can increase the stress of living with a child’s food allergy; and in many families, it is largely because of a mother’s efforts that the child can participate in normal activities (38). Mothers often feel alone and unsupported in the responsibility they undertake for their child’s food allergy in terms of safety and trying to maintain an adequate QoL (17). Lack of co-operation among family members can create tension, which may lead to breakdowns in support systems and has the potential to seriously damage relationships (17). Positively, food allergy in a child can promote greater family cohesion (11, 15). Family support is obviously an important factor when looking after a child with a chronic condition. It may also help the parent to adjust and cope with the emotional and physical aspects of having a child with food allergy (47). Social support is extremely important in a number of health outcomes and has been shown to act as a buffer against stress, depression and anxiety (48, 49). An important area of future study would be to assess the degree of social and familial support and its impact on the caregivers of children with food hypersensitivity.

A small number of studies have looked at the siblings of food allergic children. Marklund et al. (29) reported that food allergic children with a food allergic sibling are more likely to have a lower psychosocial QoL than those without food allergic siblings. This is significant because it is common for food allergies to co-exist in siblings. However, research looking at the impact on a healthy sibling found that they reported better physical health-related QoL, QoL within school and overall QoL than the norm means (9). There were no ratings of QoL that were significantly worse than their peanut allergic sibling. More research on siblings of food hypersensitive children is clearly needed. At present, there are no validated scales to measure the impact of having a food allergic sibling on QoL and generic health-related QoL scales may not be sensitive enough to measure the important factors. More qualitative work using interviews or focus groups with siblings may reveal richer data with which to explore these issues.

Burden of responsibility

The burden of responsibility that food allergy exerts upon individuals and their families can have a significant influence on QoL. Primeau et al. (14) found that peanut allergy is a condition, which forces parents to exert extreme dietary vigilance and face continuous uncertainty over the possibility of accidental exposures. Avoidance of food allergens requires constant alertness and is complicated as the presence of allergens is not always obvious. In a study of community allergic reactions to foods, 60% of participants were aware that they had a food allergy, yet over 50% were unaware that the food they were consuming contained the allergen (24). This reflects the difficulties associated with total allergen avoidance, and the burden taken on by those who see themselves as responsible for that avoidance.

Marklund et al. (32) found that in terms of adolescent food allergy, it is the measures to avoid allergens, as well as the actual allergic reactions, which negatively impacts on QoL. This suggests that adolescents experience a burden of responsibility, which negatively impacts upon their lives. Others have highlighted the fact that constant vigilance can be a source of stress (23). Children with peanut allergy perceive a higher risk than children with diabetes, with 85% of peanut allergic children compared with 50% of diabetic children reporting the need for constant care regarding the food they ate (8). This shows that it is not only parents and adults who bear the burden of responsibility but children also. Interestingly, a literature review by Feuillet-Dassonval et al. (50) concluded that the benefits of strict avoidance-diets are limited, as reactions to low doses of allergen are rare and often minimal. They suggested that avoidance should be limited to the nonhidden allergen or adapted to the dose, which is known to elicit a reaction.

As well as avoiding exposure to allergens, individuals also need to be prepared to respond to unexpected reactions. Burden seems to be related to this element of living with risk that is associated with food allergy. Gillespie et al. (38) interviewed mothers caring for food allergic children aged 6–12. The feeling of ‘living with risk’ was predominant. Risks were said to evolve from different people and environments as well as foods and experiences. Once mothers understood the risks, they described an emerging feeling of ‘living with fear’. This was described as including fear for risk to life, fear following diagnosis, fear for the present and future, and fear as their child’s world develops. The element of living with risk differs in its severity between families. Some mothers reported adapting to the risks of food allergy and incorporating it into their daily lives. However, others expressed massive implications for their lifestyle (38).

Effect of food hypersensitivity on psychological distress

Food hypersensitivity has been reported to be associated with psychological distress, including anxiety, depression and stress in the both the sufferer and the parents.

Sicherer et al. (11) found that parents of food allergic children reported stress, worry distress and anxiety. King et al. (9) also found that mothers of peanut allergic children had higher levels of state and trait anxiety and stress than fathers, with the trait anxiety and stress also being higher than norm means. Parents can be highly anxious prior to diagnosis in their child. Knibb and Semper (51) reported that a third of 124 parents of children attending allergy clinic to have their child tested for food allergy had mild to severe levels of anxiety and almost a fifth had mild to moderate levels of depression, with levels not reducing after the clinic visit.

Food hypersensitivity can also have an effect on anxiety in the sufferer. Lyons et al. (10) found that food allergy in adolescents was associated with increased anxiety levels and Avery et al. (8) reported that peanut allergic children expressed more anxieties about eating and had higher levels of anxiety and fear associated with managing their allergy than children with IDDM. Perhaps, food allergic children are aware of the immediate risk associated with accidental ingestion of allergen, whereas diabetic children are less aware of long-term implications of their condition. In contrast, King et al. (9) asked children with peanut allergy and their siblings to complete a validated child anxiety scale and found that all anxiety scores were significantly lower than published healthy age-related norms. This was possibly because of the norms coming from a sample of children in a different country. The scale was also developed to assess clinical levels of anxiety and so may not have been sensitive enough for food allergy-related anxiety. King et al. however did find that children with peanut allergy rated separation anxiety as significantly higher than their siblings and girls with peanut allergy had greater anxiety over physical injury than boys with peanut allergy.

Patten and Williams (52) investigated the association between food allergy and anxiety and depression in a large cohort of people aged 15 and over using diagnostic interviews. Those with self-reported professionally diagnosed food allergy reported significantly higher rates of major depression, bipolar disorder, panic disorder and social phobia than those with no food allergy. Although this is the first article to report elevated levels of mental disorder using diagnostic interviews, it is cross-sectional in nature and relies on self-report of food allergy and so results should be treated with caution and causality cannot be inferred. In a study of 18- to 22-year-olds, Herbert and Dahlquist (18) found that only those who reported a history of anaphylaxis reported more worry about their food allergy. There were no significant differences in anxiety or depression in those with food allergy and those without. However, online self-report measures were used in this study rather than clinical interviews and the majority of participants were college students, which may have resulted in a bias in the levels of distress reported.

Changes in distress over time

A great deal of anxiety is experienced by patients and families around the time of diagnosis of food allergy (14, 51). Following diagnosis, parents and children will often follow a period of psychosocial adjustment (17). Once parents understand the risks associated with their child’s food allergy, fear begins to emerge as a predominant emotion (38). It is likely to be this fear that promotes patients and parents to develop coping strategies to manage allergy and minimize risk. The majority of mothers with food allergic children state that in time, they learn to adjust to living with food allergy, gaining confidence and control and losing some elements of fear. Mothers often stated that they work hard to achieve a normal life for their food allergic child and that once management is established, they no longer found it hard on a daily basis (38). This suggests that the longer the duration since food allergy diagnosis, the lower the impact upon QoL and psychological distress. It has also been shown that anaphylactic reaction-free periods also result in a decrease in anxiety levels (17). However, new situations, including parties or school trips, can cause fear and anxiety in relation to food allergy, to resurface at higher levels (38). In some cases, overprotective parenting has been reported by young adults with food allergy who have a history of anaphylaxis (18).

Mandell et al. (17) has described how normal development throughout childhood itself poses a cause for variation in anxiety levels of both allergic children and their parents. Most anxiety is observed between the ages of 6–11 when children are able to begin comprehending their allergy, but their level of ability to self-protect against exposure remains inadequate. This age range in children also involves a development of independence and poses circumstances of less supervision, which also act to promote higher anxiety levels. The period of starting school is also a concern for parents. Mothers often find it difficult to completely relax when their children are attending school, away from their supervision (38). As children grow into teenagers, parents have reported anxiety in handing over the responsibility to their child for their risk assessment, avoidance strategies and management of their food allergy, and it is suggested there is a risk that they may transfer their anxieties to their children (36).

Mechanisms for the link between psychological distress and food allergy

In a review of the literature on allergies and anxiety in children and adolescents, Friedman and Morris (53) put forward cognitive behavioural and biological explanations for the link between anxiety and food allergy. The role of learning and parental modelling of anxious behaviour to activities such as administering emergency treatment can lead to increased anxiety in the child. Alternatively, greater sympathetic or autonomic nervous system activity or a genetic link between anxiety and allergic disorders could be responsible. However, the authors point out that at present the theories have little empirical support and do not offer a causal explanation, instead suggesting there may be a bidirectional effect and biological and environmental factors may influence each other.

There is also debate as to whether or not anxiety could be perceived as beneficial. Avery et al. (8) suggested that the high levels of anxiety experienced by food allergic children, although impacting adversely upon QoL, could be interpreted as protective if it encourages them to comply with adequate avoidance measures and management plans. Mandell et al. (17) supported this theory, stating that appropriate levels of anxiety can be constructive in enabling families to manage the allergy. They found that anxiety motivated parents to gain information and support regarding allergy management. Lower levels of anxiety were accompanied by decreased vigilance and preparedness for potential reactions, suggesting that a certain level of anxiety is mandatory for adequate management (17). However, high levels of anxiety may be maladaptive, for example, if it places unrealistic restrictions on an individual’s life (8).

It is clear that the mechanisms involved need further investigation, utilizing longitudinal methodology to explore how food hypersensitivity impacts on psychological distress and in turn how such distress affects management of food hypersensitivity and future health, not just in the patient but also in the carer. Prolonged stress and anxiety and depression have been shown to impact on other areas of health (54, 55). Strategies to reduce psychological distress in those suffering from or caring for those with food hypersensitivity also need to be put into place and properly evaluated.

Summary and conclusions

It is evident that food allergy has a profound psychosocial impact on children, adolescents and their families. In particular, the constant vigilance needed to avoid allergens and the daily management of food allergy impacts on daily family activities and social events. Food allergy also appears to have a considerable detrimental affect on certain aspects of QoL such as emotional QoL, physical functioning and quality of school life. Certain subgroups of patients and care-givers seem to be most affected. Females with food allergy, those with a larger number of food allergies or a larger number of previous reactions and those with co-existing atopic diseases report poorer QoL. Parents of younger children report a more negative impact on family activities, whilst adolescents are clearly at greater risk of adverse reactions as their autonomy develops. The psychosocial well-being of mothers of children with food allergy also seems to be particularly affected.

There have been no intervention programmes to indicate how we can alleviate the burdens for food allergic children or their families, however the studies discussed in this review enable us to speculate strategies that may be beneficial. Extreme dietary vigilance is often necessary for children with food allergies, and this itself imparts a burden on the food allergic family. Patients can be reassured that by adhering to management plans accidental reactions are uncommon and are usually mild (56). Educating children and families to understand the relative risks of their allergy and providing them with communication skills through role play (e.g., being offered sweets, ordering in restaurants) should relieve the burden by empowering the children and their parents. Food allergy is unusual in that the child has a chronic condition but remains well with the potential to become acutely very sick. There is a need to educate the wider community including educators, the wider family and friends to understand the constant need for vigilance, with potential need for emergency treatment, whilst striving to maintain a normal home, school and social life. Training of school personnel and management plans for use in school may help to reduce parental anxieties. Labelling of allergens continues to cause frustration and confusion to food allergic consumers. The food industry and its regulators need to continue seeking a solution, which provides safe information whilst avoiding unnecessary precautionary labels.

To date, interpretation of and comparisons between studies investigating psychological outcomes in children with food allergies have been limited by lack of appropriate study tools, questioning of parents rather than children and of poor phenotyping of the allergic disorder. Current literature has shown that assessing the psychosocial impact of food allergy can be difficult. To rectify this food allergy-specific QoL instruments for children, adolescents and adults have recently been developed and validated (57), and it is anticipated that this will facilitate an expansion of research in the field. The Food Allergy QoL Parental Burden questionnaire (FAQL-PB) measures the parental burden associated with having a food allergic child (58). More recently, instruments have been developed and validated to allow parents to report on QoL in the child from the child’s perspective (59) and for children and teenagers to report on their own QoL (60, 61).

The number of studies looking at the impact of food allergy has increased within the last few years, and this recent development of validated, food allergy-specific tools for studying QoL in children and adolescents should facilitate further research. Studies will need to distinguish between IgE-mediated food allergy and other types of adverse food reactions and future studies need to question the child in addition to obtaining parental perceptions. The effective management of food allergy in terms of optimizing a patient’s and family’s QoL is currently restricted by the availability of good quality information. Therefore, further data are required to achieve an optimum standard of management, which itself can influence and improve QoL and reduce the psychological distress felt by all.

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