Body recomposition means losing fat and gaining muscle at the same time, rather than doing them in separate phases. It works, it is slower than either job done alone, and it lives or dies on getting your calorie target close to maintenance rather than far from it.
Why maintenance is the right target
Fat loss needs a deficit. Muscle gain is easier in a surplus. Recomposition asks for both at once, which is why it sits at or very near your maintenance calories.
Sit too far below and you will lose fat quickly while your training falls apart and muscle goes with it. Sit too far above and you will add muscle alongside a layer of fat you will have to remove later.
The practical range for most people is somewhere between maintenance and about 250 calories below it. Work out your TDEE first, because a target this narrow is unforgiving of a bad estimate. If your maintenance figure is 300 calories out, you are not doing recomposition. You are doing a slow bulk or a slow cut and calling it something else.
Who it actually works for
Recomposition is not equally available to everyone.
It works best for people new to training, people coming back after a long break, and people carrying a decent amount of fat to work with. All three have a large gap between where their body is and where training can take it, and that gap is what makes both processes possible at once.
It works poorly for lean, experienced lifters. If you have trained hard for years and you are already fairly lean, there is no easy muscle left to claim, and you will make faster progress cutting and bulking in separate blocks. Our guide to cutting versus bulking covers when to do that instead.
Protein does the heavy lifting
If you take one thing from this, take this. Protein is what makes recomposition possible at maintenance calories.
Aim for 1.6 to 2.2 grams per kilogram of body weight, spread across the day rather than dumped into one meal. Protein keeps you full, it costs energy to digest, and it supplies the raw material for building muscle while you are not eating a surplus to fund it.
Carbohydrate is the next priority, mainly to fuel training. Put more of it around your sessions and less on rest days if that suits you. Fat fills the remainder and should not go too low, because hormone production needs it.
Training decides which way the body moves
Calories decide whether your weight goes up or down. Training decides whether the change is muscle or fat.
Lift, and lift progressively. Add weight or reps over time. Cover the main compound patterns rather than filling a session with isolation work. Two or three sessions per muscle group per week beats one.
Cardio can stay, and it should for your heart, but do not let it grow until it eats the whole margin you are working with.
Why the scale will frustrate you
This is the part people are not warned about. During a successful recomposition the scale may barely move for months.
That is what success looks like here. You are trading fat for muscle at roughly equal weight, so the number stays flat while the body underneath changes. Judge it by how clothes fit, by photographs taken in the same light every four weeks, by a tape measure around the waist, and by whether the weights are going up.
If you want a composition number, pick one method and stick to it. Our guide to measuring body fat covers what each method is good for.
Common ways it goes wrong
Cutting calories hard because progress feels slow. That converts a recomposition into a diet, and the muscle side stops.
Changing the plan every three weeks. This process is slower than either alternative, and it needs a few months before the verdict is in.
Forgetting to recalculate. As your weight and training change, so does your maintenance figure. Our piece on when to recalculate your TDEE explains how often to bother.
Skipping sleep, then wondering why nothing works. Recovery is where the muscle actually gets built.