Macros for body recomposition: how to eat to lose fat and build muscle

Body recomposition, or recomp, is the goal of losing fat and building muscle at the same time. Most diet plans push you toward one or the other: a cut strips weight off, a bulk adds it on. Recomposition aims to hold your overall weight fairly steady while the makeup of that weight shifts, less fat and more muscle, so the scale can barely move while your shape changes underneath it.

It is not a trick, and it is not equally easy for everyone. Recomp tends to work best when you have room for your body to do both jobs at once. That favors three groups in particular: people new to resistance training, who adapt quickly to a new stimulus; people returning after time away, whose muscle comes back faster than it was first built; and people carrying higher body fat, who have more stored energy on hand to fuel muscle growth even while eating at or below maintenance.

For someone who is already lean and well trained, simultaneous fat loss and muscle gain slows to a crawl, and the usual advice is to pick a focused cut or a focused gaining phase instead. That is not a failure of the approach, just a sign that the easy wins have already been collected. Knowing which group you are in sets a realistic pace before you touch a single macro.

Recomp macros are simplest to set in order: protein first, then calories, then everything else. Get the first two right and the rest has a lot of room to flex around your tastes and your training.

Start with protein. This is the macro that protects muscle while you are eating near or below maintenance, so it earns the first and firmest number. A well-supported range is about 1.6 to 2.2 grams of protein per kilogram of body weight per day, roughly 0.7 to 1.0 grams per pound. Spread it across your meals rather than backloading it, since a steady supply through the day supports muscle repair better than one large serving.

Then set your calories. Recomp lives near your maintenance level, the intake that holds your weight steady. From there, a modest deficit of roughly 200 to 300 calories below maintenance nudges fat loss without starving the muscle-building process, which needs energy and recovery to work. This is deliberately a gentle adjustment. Aggressive deficits push the body to give up muscle along with fat, which is the opposite of the point. Sitting at maintenance is also a valid choice, especially for beginners, since the training stimulus alone can shift composition.

Fill the rest with carbs and fat. Once protein and total calories are set, the remaining calories split between carbohydrates and fat largely by preference and how you train. Carbs fuel hard sessions, so people doing intense resistance or interval work usually feel and perform better with carbs on the higher side, especially around training. Fat supports hormones and satiety and should not be cut too low. There is no single perfect ratio here. Within sensible bounds, the split that keeps you full, energized for your workouts, and consistent is the right one.

Macros set the conditions, but they do not build muscle on their own. The actual signal to keep and grow muscle comes from resistance training. Without it, eating at a deficit tends to shed weight from both fat and muscle, and high protein alone cannot tell the body which to keep. Challenging your muscles through progressive resistance work, gradually adding load, reps, or quality over time, is what gives the protein you eat a job to do. Training is the stimulus; the macros are the support.

The second thing to make peace with is the timeline. Recomposition is slow and rarely moves in a straight line. Because two changes are happening at once and partly cancel each other on the scale, weight can stay nearly flat for weeks while your body composition quietly shifts. That makes the scale a poor sole judge of progress. Photos taken under the same conditions, tape measurements, strength gains in the gym, and how your clothes fit all tell the story far better than a single morning weigh-in.

None of this is a guaranteed outcome on a fixed schedule, and individual results vary with genetics, training history, sleep, and consistency. The honest expectation is months of steady effort with gradual, uneven change, not a dramatic transformation in a few weeks. People who stick with recomp are usually the ones who measured the right way, kept protein and training consistent, and let the trend play out instead of chasing the scale day to day.