Disclosure: The authors declare no conflict of interest with reference to the material discussed in this manuscript.
A randomized trial of energy-restricted high-protein versus high-carbohydrate, low-fat diet in morbid obesity
Article first published online: 13 APR 2013
Copyright © 2013 The Obesity Society
Volume 21, Issue 9, pages 1774–1781, September 2013
How to Cite
Dalle Grave, R., Calugi, S., Gavasso, I., El Ghoch, M. and Marchesini, G. (2013), A randomized trial of energy-restricted high-protein versus high-carbohydrate, low-fat diet in morbid obesity. Obesity, 21: 1774–1781. doi: 10.1002/oby.20320
- Issue published online: 23 SEP 2013
- Article first published online: 13 APR 2013
- Accepted manuscript online: 14 FEB 2013 07:15AM EST
- Manuscript Accepted: 21 NOV 2012
- Manuscript Received: 17 JUL 2012
Conflicting evidence exists as to weight loss produced by diets with different carbohydrate/protein ratio. The aim was to compare the long-term effects of high-protein vs. high-carbohydrate diet (HPD, HCD), combined with cognitive behavior therapy (CBT).
Design and Methods
In a randomized trial, 88 obese participants (mean age, 46.7; mean BMI, 45.6 kg m−2) were enrolled in a 3-week inpatient and 48-week outpatient treatment, with continuous CBT during the study period. All subjects consumed a restricted diet (1,200 kcal day−1 for women, 1,500 for men; 20% energy from fat, <10% saturated fat). HPD derived 34% energy from proteins, 46% from carbohydrates; HCD 17% from proteins, 64% from carbohydrates. The primary outcome was 1-year percent weight loss. Secondary outcomes were attrition rates and changes in cardiovascular risk factors and psychological profile.
Attrition rates were similar between groups (25.6%). In the intention-to-treat analysis, weight loss averaged 15.0% in HPD and 13.3% in HCD at 1 year, without any difference throughout the study period. Both diets produced a similar improvement in secondary outcomes.
The relative carbohydrate and protein content of the diet, when combined with intensive CBT, does not significantly affect attrition rate, weight loss and psychosocial outcome in patients with severe obesity.