UCP2 expression is associated with weight loss after hypocaloric diet intervention

Area of Science:

• Genetics and Metabolism
• Obesity Research
• Nutritional Science

Background:

• Energy restriction for weight loss can reduce metabolic rate, hindering long-term success.
• Genetic factors, including uncoupling proteins (UCP1, UCP2) and beta-3-adrenoceptor (ADRB3), are implicated in obesity development.
• The influence of specific genes on weight loss outcomes in response to dietary interventions requires further investigation.

Purpose of the Study:

• To investigate the association between UCP1, UCP2, and ADRB3 gene expression and weight loss in severely obese women.
• To evaluate the impact of a hypocaloric diet on body composition and resting metabolic rate in this population.

Main Methods:

• A longitudinal study involving 21 severely obese women (BMI ≥ 40 kg/m²) undergoing a 6-week, 1200 kcal/day hypocaloric diet.
• Control group comprised 10 normal-weight women (BMI 18.5-24.9 kg/m²).
• Measurements included weight, BMI, waist circumference, body composition, resting metabolic rate (RMR), and adipose tissue collection, with statistical analyses using t-tests, Spearman correlation, and multivariate linear regressions (P<0.05).

Main Results:

• Significant reductions in weight, BMI, fat-free mass, fat mass, and RMR were observed post-intervention in the obese group.
• Multivariate regression analysis revealed that UCP2 gene expression was significantly associated with weight loss following the dietary intervention (P=0.05).

Conclusions:

• UCP2 gene expression is associated with successful weight loss in severely obese women after a hypocaloric diet.
• These findings highlight a potential genetic marker for predicting weight loss response to dietary interventions.