Body Composition Alteration | CSCS Chapter 10

Nutrition strategies for body composition alteration rely on managing energy balance, where caloric intake must align with expenditure to maintain weight, or deviate to facilitate muscle growth or fat loss. Building muscle mass requires a caloric surplus coupled with high protein intake—ideally 1.5 to 2.0 grams per kilogram of body weight—to support protein synthesis. Conversely, achieving fat loss necessitates a caloric deficit while maintaining high protein levels to preserve metabolically expensive muscle tissue. BMI functions as a population-based screening tool rather than a precise diagnostic metric, as it does not differentiate between fat and lean mass. Furthermore, extreme weight loss methods, including prolonged fasting, dehydration, and the misuse of thermogenic aids, carry severe health risks such as electrolyte imbalances and organ failure, underscoring the necessity of professional guidance when pursuing body composition changes.