Macros Explained: Protein, Carbs, and Fat Made Simple

Protein (4 kcal per gram) builds and repairs tissue — muscle included — and is the most satiating macro. It also has the highest thermic effect: 20-30% of protein calories are burned just digesting it.

Carbohydrate (4 kcal per gram) is your primary training fuel, stored in muscle as glycogen. Carbs are not required for survival, but for hard training they are the difference between a strong session and a grind.

Fat (9 kcal per gram) supports hormone production — including testosterone — and the absorption of vitamins A, D, E, and K. Chronically very low fat intake (below ~0.5 g/kg) can suppress hormones.

Calories first: your total intake decides whether you gain or lose weight; macros decide what that change is made of. Work out maintenance calories, then apply your surplus or deficit.

Protein second: 1.6-2.2 g/kg of body weight, toward the high end when dieting. This is the least negotiable number.

Fat third: 0.6-1.0 g/kg as a baseline for hormonal health — around 20-30% of total calories for most people.

Carbs last: everything left over. Lifters training hard typically land at 3-6 g/kg, and pushing carbs around training sessions is where they earn their keep.

Percentage-based splits are popular because they're simple, but they scale badly: 30% protein on a 1,500-kcal cut is 112 g, while the same ratio at 3,500 kcal is 262 g — one might be too little, the other pointlessly high. Per-kilogram targets adjust to your body; ratios adjust to your calculator.

Within sensible protein and fat floors, the carb-to-fat ratio is largely personal preference. Studies comparing low-carb and low-fat diets with matched calories and protein find nearly identical fat loss. Pick the split you can sustain.

You don't need gram-perfect tracking forever. Log honestly for 4-6 weeks and you'll internalize portion sizes and the macro content of your usual foods — that education is the real payoff.

Hit protein within ±10 g daily, keep calories within ±5%, and let carbs and fat float with your appetite and training. Precision beyond that produces stress, not results.