Higher Protein Intakes Predict Leaner Body Composition in Weight-Loss Participants-Findings from the International...

Area of Science:

• Nutrition Science
• Exercise Physiology
• Obesity Research

Background:

• High protein diets combined with exercise are commonly recommended for fat loss and muscle preservation during weight management.
• This study investigated the interplay between dietary protein, physical activity, and body composition in individuals actively trying to lose weight.

Purpose of the Study:

• To evaluate the associations between dietary protein intake, physical activity levels, and changes in body weight and composition.
• To determine if protein intake modifies the effects of physical activity on weight loss outcomes.

Main Methods:

• Secondary analysis of 203 participants from the International Weight Control Registry (August 2022 - January 2023).
• Dietary protein intake assessed via 24-hour recalls; body weight, body fat (%), and muscle mass (%) measured using consumer devices.
• Multiple linear regression models analyzed associations between protein intake, daily steps, and body composition metrics (BMI, %BF, %muscle).

Main Results:

• Higher total protein intake was significantly associated with lower BMI, lower body fat percentage, and higher muscle mass percentage.
• Increased daily steps also correlated with lower BMI, lower body fat, and higher muscle mass.
• Protein intake showed significant associations with BMI across all activity levels, with the strongest effects noted around 5,000 daily steps.

Conclusions:

• Findings support the role of high protein intake in achieving lower body weight and improved body composition (reduced body fat, increased muscle mass).
• Individuals with lower physical activity levels may benefit from higher protein consumption to support weight management.
• Both protein intake and physical activity are critical components for successful weight loss and body composition improvement.