Building muscle requires more than just lifting weights. Your macronutrient intake determines whether your body has the raw materials and energy to synthesize new muscle tissue. This guide covers how to calculate your ideal protein, carbohydrate, and fat targets for lean muscle gain, with practical examples, evidence-based supplement recommendations, and training nutrition strategies grounded in peer-reviewed research.
Muscle growth (hypertrophy) occurs when the rate of muscle protein synthesis exceeds the rate of muscle protein breakdown. To create this environment consistently, your body needs three things from your diet:
Without the right macro balance, even the best training program will produce suboptimal results. You cannot out-train a poor diet when it comes to building muscle. Research published in the Journal of the International Society of Sports Nutrition confirms that total daily protein and calorie intake are the primary dietary drivers of muscle hypertrophy.
Start by finding your Total Daily Energy Expenditure using the Mifflin-St Jeor equation:
Men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
Women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161
Is there a specific app you recommend for tracking these macros?
Do you adjust your calories on rest days or keep them the same?
Would this be too much volume for someone with a slow metabolism?
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