Nutrition for Muscle Growth: Protein, Carbs, Fat and Timing

Training gives your muscles a reason to grow. Nutrition supplies the material and energy to do it. The research on muscle-building nutrition has become fairly clear, and most of it comes down to a handful of habits rather than precise timing or expensive products.

Calories: a modest surplus

Building muscle costs energy. Eating slightly more than you burn, about 250 to 500 calories a day, supports growth while limiting fat gain. Aim to gain roughly 0.25 to 0.5 percent of body weight a week; faster than that is mostly fat. Beginners and people returning after a break can build muscle even at maintenance.

Protein: the building block

A large meta-analysis found that protein intakes beyond about 1.6 g per kg of body weight a day added little extra muscle on average, with some people benefiting up to 2.2 g. Spreading protein over three to five meals keeps muscle protein synthesis elevated through the day. Good sources include chicken, fish, eggs, Greek yogurt, cottage cheese, tofu, lentils and protein powder.

Carbohydrates: fuel for training

Hard lifting runs largely on stored glycogen. Carbohydrates top it up, help you train with more volume, and support recovery. Most lifters do well with 3 to 6 g per kg of body weight a day, more if training volume is high. Choose mainly whole grains, potatoes, fruit, oats and legumes, with faster carbs around training if you like.

Fat: hormones and health

Dietary fat supports hormone production and absorption of fat-soluble vitamins. About 20 to 35 percent of calories from fat suits most people. Very low-fat diets over long periods can lower testosterone modestly. Favour olive and canola oil, nuts, seeds, avocado and fatty fish.

Timing that matters (and what does not)

• Matters: total daily calories and protein, and spreading protein through the day.
• Helps: a meal with protein and carbs within a few hours before and after training.
• Helps a little: a protein-rich snack before bed.
• Overstated: the 30-minute post-workout window.

Supplements worth considering

Supplement	Evidence
Creatine monohydrate, 3 to 5 g a day	Strong: more strength and muscle with training
Protein powder	A convenient way to reach protein targets
Caffeine before training	Moderate: improves performance for many
Vitamin D in winter	Useful if you are low, common in Canada
BCAAs	Little benefit if protein intake is adequate

A simple day of eating

For an 80 kg lifter eating about 3,000 calories: Greek yogurt with oats and berries at breakfast; a chicken, rice and vegetable lunch; a protein shake and banana before training; salmon, potatoes and salad after; cottage cheese before bed. That covers about 170 g of protein without any special timing tricks. Work out your own numbers with the macro calculator.

Common mistakes

• Undereating and calling it a bulk
• Gaining weight too fast and spending months cutting it off
• Relying on shakes instead of meals
• Skimping on sleep, which undermines everything above