Nutrient Partitioning: P-Ratio, Lean Bulking & Energy Surpluses
By Strength & Exercise Physiology Review Board•
Physiology & Training Takeaway
Optimizing body composition: determining individual P-Ratios, 250–400 kcal lean surpluses, and carbohydrate fueling for glycogen-depleting workouts.
Energy surplus determines the rate of tissue accretion, while nutrient partitioning (P-Ratio) dictates the proportion of weight gained as muscle vs adipose tissue.
1. Optimal Lean Surplus Guidelines
Controlled Caloric Surplus: An energy surplus of 200–350 kcal/day (roughly 0.25–0.5% body weight gain per week) minimizes fat accumulation while maximizing muscle protein accrual.
Carbohydrate Requirements: High-glycemic carbs (4–7g/kg) spare muscle protein from gluconeogenesis and replenish intramuscular glycogen stores.
Essential Dietary Fats: Maintaining fat intake at 20–30% of total daily calories supports endogenous androgen synthesis and cell membrane integrity.
🏋️
Strength & Exercise Physiology Review Board
Our editorial team includes CSCS certified strength and conditioning specialists, sports nutritionists, and biomechanists reviewing muscle protein synthesis trials, mTORC1 signaling pathways, and lifting torque mechanics.
Unlock Customized Periodization Blueprints
Structured progressive overload routines optimized for your lifting experience and recovery capacity.