Nutrition for Muscle Building: What Science Says About Protein, Timing, and Calories
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The Calorie Surplus: How Much Is Needed
Muscle tissue contains roughly 100–150 kcal per gram of protein laid down. Net rates of muscle gain: untrained beginners can gain 1–2 kg lean mass/month; intermediate lifters 0.5–1 kg/month; advanced 0.25–0.5 kg/month. Required surplus: only 100–300 kcal/day above TDEE for natural muscle gain. Larger surpluses primarily add fat, not extra muscle beyond a certain threshold.
Protein: The Non-Negotiable
Current consensus (International Society of Sports Nutrition): 1.6–2.2g protein/kg body weight/day for maximizing muscle protein synthesis (MPS). Beyond 2.2g/kg shows diminishing returns. Leucine is the key amino acid that triggers MPS — each meal should contain 2–3g leucine (roughly 20–40g of quality protein). All amino acids must be available simultaneously for optimal MPS — meal composition matters.
Protein Distribution Matters
Spreading protein evenly throughout the day (3–4 meals with 30–40g protein each) produces greater 24-hour MPS than one large protein bolus. The “anabolic window” is real but wider than the gym myth suggests — MPS remains elevated for 3–5 hours after training. A pre-sleep protein dose (40g casein or slow-digesting protein) stimulates overnight MPS.
Carbohydrates for Performance and Recovery
Carbs fuel high-intensity resistance training (via glycolysis and stored glycogen). Low-carb diets impair training performance and reduce training volume — which reduces the muscle-building stimulus. Peri-workout carbs (before and after training) replenish glycogen and reduce muscle protein breakdown. Target: 3–5g/kg carbohydrates for moderate training volume.
The Role of Creatine
Creatine monohydrate is the most researched and proven legal performance supplement. 3–5g/day increases phosphocreatine stores → higher training intensity → greater hypertrophic stimulus. Direct: creatine also has modest anabolic signaling effects independent of training intensity. Compatible with all protein sources including vegan protein (vegans respond more strongly — lower dietary creatine baseline).
Vegan Muscle Building
Vegan athletes can build muscle equivalently to omnivores given: adequate total protein (may need 2.0–2.2g/kg given lower leucine density of plant proteins), emphasis on soy, pea, tempeh (highest leucine plant sources), creatine supplementation (essential — no dietary creatine), and vitamin B12 supplementation.
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