Goal
Body recomposition
Losing fat while gaining muscle is possible, but slow. Who it works best for, how to set calories and protein, and how to tell whether it is working.
What recomposition is
Body recomposition means losing fat and gaining muscle over the same period, so the mirror and the tape measure change more than the scale does. It sits between the two guides it builds on: eating in a calorie deficit and eating to build muscle.
It is usually associated with people who are new to resistance training, returning after a break or carrying more body fat. A review in the Strength and Conditioning Journal found it reported in trained lifters as well, although you should expect slower change the more experienced you are.
Setting calories and protein
Eat at around maintenance, or in a small deficit if fat loss matters more to you. A meta-analysis of resistance-training studies found that energy deficits blunted gains in lean mass while strength still improved, and that a deficit of about 500 kcal a day was enough, on average, to cancel the gain in lean mass altogether.
Protein does the protecting. In a meta-analysis of 49 trials, protein supplementation beyond a total intake of about 1.6 g per kg of body weight a day brought no further gain in fat-free mass. Sports nutrition guidance is 1.4–2.0 g per kg for most people who train, and possibly more for lean, trained people in a deficit.
Training and tracking progress
None of this works without progressive resistance training: the signal to build muscle comes from the training, and food only supports it. Train each muscle group consistently, try to add weight or repetitions over time, and protect your sleep, which the same review flags as a factor.
Because fat loss and muscle gain can cancel out on the scale, judge progress over months using a waist measurement, photos, how clothes fit and whether your lifts are going up. If nothing has changed after a couple of months, pick a clearer goal: a modest deficit or a small surplus.
Worth knowing
- Home body-fat scales and similar estimates are imprecise; every method of measuring body composition has limitations. Small changes in a reading may be noise.
- If building muscle is the priority, prolonged deficits work against you. A small surplus is the more reliable route.
- If you have kidney disease, talk to your doctor before raising your protein intake.
Common questions
Can I recompose while eating at maintenance?
Yes, that is the usual approach. With enough protein and progressive training, fat can fall and muscle rise slowly while your weight stays roughly level.
Why has the scale not moved?
That can be the point. Losing a kilo of fat while gaining a kilo of muscle shows as no change in weight. Use your waist measurement, photos and training log instead.
Sources
- Murphy and Koehler (2022): Energy deficiency impairs resistance training gains in lean mass but not strength, meta-analysis, Scand J Med Sci Sports
- Morton et al. (2018): Protein supplementation and resistance training, systematic review and meta-analysis, Br J Sports Med
- International Society of Sports Nutrition position stand: protein and exercise (2017)
- Body recomposition: can trained individuals build muscle and lose fat at the same time? Narrative review, Strength and Conditioning Journal (2020)
General information, not medical or dietary advice. Speak to a doctor or registered dietitian about your own situation.
