Reduced carbohydrate diet to improve metabolic outcomes and decrease adiposity in obese peripubertal African American...

Area of Science:

• Pediatric Endocrinology
• Nutritional Science
• Obesity Research

Background:

• Obesity is disproportionately high in African American girls.
• Traditional obesity treatments show limited success in this demographic.
• Macronutrient composition may offer an alternative therapeutic approach.

Purpose of the Study:

• To assess the impact of a reduced carbohydrate diet versus a standard carbohydrate diet on weight and fat loss.
• To evaluate metabolic parameter changes in overweight/obese African American girls aged 9-14 years.

Main Methods:

• 26 African American girls (BMI ≥ 92nd percentile) were randomized to a reduced carbohydrate (SPEC: 42% energy) or standard carbohydrate (STAN: 55% energy) diet for 16 weeks.
• Diets were provided, with an initial 5-week eucaloric phase followed by an 11-week hypocaloric phase (1000 kcal/day deficit).
• Body composition was assessed using dual-energy x-ray absorptiometry; metabolic analyses included meal tolerance tests.

Main Results:

• Both groups showed weight and adiposity reduction, though not statistically significant between groups.
• The reduced carbohydrate diet group demonstrated improved glucose and insulin homeostasis post-meal.
• Significantly lower triglyceride levels were observed in the reduced carbohydrate diet group (P < 0.001).

Conclusions:

• A reduced carbohydrate diet positively impacts metabolic markers like glucose, insulin, and triglycerides in obese African American girls.
• This dietary approach did not yield superior weight or fat loss compared to a standard diet within the study duration.
• Long-term studies are necessary to confirm the sustained metabolic benefits and potential for weight management with reduced carbohydrate intake.