Macros explained — protein, carbs and fat for beginners

“Macros” are the three nutrients that supply energy: protein, carbohydrate and fat. Calories come from them — 4 kcal per gram of protein and carbs, 9 per gram of fat.

Protein: the priority

Protein builds and preserves muscle. The research points to roughly 1.6 g per kg of bodyweight for muscle growth, rising toward 2.0–2.2 g/kg when you’re in a calorie deficit and want to protect lean mass. There’s no benefit to extreme amounts.

Fat: enough, not zero

Fat supports hormones and absorption of some vitamins. Keep it at a floor of about 0.8–1.0 g/kg — going very low has no advantage.

Carbs: the flexible remainder

Once protein and fat are set, the rest of your calories go to carbs. They fuel training and recovery. Low-carb works for some, but carbs aren’t the enemy — total calories and protein matter far more.

A simple split

Set protein per your bodyweight, set a fat floor, fill the rest with carbs. The macro calculator does exactly this from your calorie target.

Remember the bigger picture: macros are one half of the plan. Training is the other. Build both together.

General nutrition education, not medical advice.