Body composition and energy intake — skeletal muscle mass is the strongest predictor of food intake in obese adolescents: The HEARTY trial

Apr 26, 2016Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme

Skeletal muscle mass best predicts how much obese teenagers eat

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Abstract

A sample of 304 overweight and obese adolescents showed that skeletal muscle mass is the strongest predictor of energy intake (EI).

Resting metabolic rate (RMR), fat-free mass (FFM), and fat mass (FM) were significantly correlated with EI.
After controlling for age, sex, height, and physical activity, only FFM and skeletal muscle mass remained significant predictors of EI.
Skeletal muscle mass predicted dietary protein and fat intake but not carbohydrate intake.
The findings suggest that greater amounts of lean tissue are associated with higher levels of EI in inactive adolescents with obesity.

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There has been renewed interest in examining the relationship between specific components of energy expenditure and the overall influence on energy intake (EI). The purpose of this cross-sectional analysis was to determine the strongest metabolic and anthropometric predictors of EI. It was hypothesized that resting metabolic rate (RMR) and skeletal muscle mass would be the strongest predictors of EI in a sample of overweight and obese adolescents. 304 post-pubertal adolescents (91 boys, 213 girls) aged 16.1 (±1.4) years with body mass index at or above the 95th percentile for age and sex OR at or above the 85th percentile plus an additional diabetes risk factor were measured for body weight, RMR (kcal/day) by indirect calorimetry, body composition by magnetic resonance imaging (fat free mass (FFM), skeletal muscle mass, fat mass (FM), and percentage body fat), and EI (kcal/day) using 3 day food records. Body weight, RMR, FFM, skeletal muscle mass, and FM were all significantly correlated with EI (p < 0.005). After adjusting the model for age, sex, height, and physical activity, only FFM (β = 21.9, p = 0.007) and skeletal muscle mass (β = 25.8, p = 0.02) remained as significant predictors of EI. FFM and skeletal muscle mass also predicted dietary protein and fat intake (p < 0.05), but not carbohydrate intake. In conclusion, with skeletal muscle mass being the best predictor of EI, our results support the hypothesis that the magnitude of the body's lean tissue is related to absolute levels of EI in a sample of inactive adolescents with obesity.

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Body composition and energy intake — skeletal muscle mass is the strongest predictor of food intake in obese adolescents: The HEARTY trial

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