Calories and Body Composition, Without the Dogma

Calories set the direction of your body composition. A slight surplus of energy favors building muscle, a deficit favors losing fat, and eating near maintenance supports slow recomposition over time. Everything else in nutrition is a detail layered on top of that.

Building (a lean bulk)

To build muscle with minimal fat gain, aim for a modest surplus, often around 250 to 500 calories above maintenance, or roughly 10 to 15 percent. Bigger surpluses do not build muscle faster past a point; they mostly add fat you will later have to diet off. Pair the surplus with progressive training and adequate protein, and gain gradually.

Leaning out (a cut)

To lose fat, run a moderate deficit while keeping protein high and continuing to train hard. Keeping the resistance training in place is what signals your body to hold onto muscle while it sheds fat. The position stand on diets and body composition notes that a wide range of dietary styles, from lower fat to lower carb, can work about equally well, so pick the one you can stick to (Aragon et al., 2017).

The big rocks

Total calories, enough protein, progressive training, and sleep you actually recover from are the big rocks. Meal timing, specific "clean" foods, and most supplements are rounding errors by comparison. Get the fundamentals consistent first, and stay skeptical of anyone selling you the small stuff as if it were the secret.