Background and purpose
Studies of high body mass index (BMI) and cognition in the elderly have shown conflicting results. While some studies have shown a detrimental effect of high BMI on cognitive function, others have observed beneficial effects on cognition. Our aim was to assess cognitive function in a large population-based sample of overweight (BMI 25–29.9 kg/m2) and obese (BMI ≥ 30 kg/m2) community-dwelling elderly participants compared with their counterparts with BMI < 25 kg/m2 (i.e. controls) living in the same population.