What a body recomposition diet is, what the research backs, and how to set one up if you lift and want to lose fat.
Losing fat while holding on to muscle is possible, but only a few habits do most of the work. Here is what the research supports.
What body recomposition means
Body recomposition is losing fat and building or keeping muscle at the same time. A review of trained lifters found it isn’t limited to beginners, and named progressive resistance training and good nutrition as the key factors. The authors also say more research is needed, so treat it as slow work.
The four things that matter
- Lift, and add load over time. Training is the signal that tells your body to keep muscle.
- Eat enough protein. In a meta-analysis of 49 trials, gains in fat-free mass stopped growing past about 1.6 g/kg a day. That analysis looked at protein supplementation during training, so treat it as a solid target, not a hard ceiling.
- Keep the deficit small. A meta-analysis of deficit trials found that deficits above roughly 500 kcal a day impaired lean mass gains.
- Sleep. In a small crossover study of 10 adults on a calorie-restricted diet, 5.5 hours of sleep cut fat loss by 55% and raised lean mass loss by 60% compared with 8.5 hours.
Key takeaway: Train hard, hit your protein, cut calories gently, and sleep.
Protein: how much and how to spread it
For a 75 kg (165 lb) person, 1.6 g/kg is about 120 g a day. The authors of a review on per-meal protein suggest about 0.4 g/kg per meal across at least four meals, which is roughly 30 g each for that person.
Hitting that number every day is the hard part. Proteinly’s automatic eating timer reminds you to eat every 2 hours, which turns “I should eat protein” into a routine. It’s a habit tool, not a trick that builds muscle by itself.
What about the post-workout window?
The old advice to drink protein within 30–60 minutes of training doesn’t hold up. A meta-analysis of protein timing trials found no significant difference once other factors were controlled, and total protein intake was the strongest predictor of muscle gain. Eat your protein across the day and don’t stress about the clock after your last set.
Fiber and fullness
Fiber helps some people feel full, but not reliably. A systematic review found only 39% of fiber treatments reduced appetite ratings and 22% reduced intake. Eat plenty of vegetables, beans and whole grains, and expect fullness to come mostly from protein-rich meals.
Frequently asked questions
Do I need to count calories?
A small deficit matters, as the deficit research above shows. Counting is one way to get one, not the only way. Protein-first meals and a weigh-in on the same day each week work for many people.
Can beginners and experienced lifters both recomp?
Yes, per the trained-lifter review above, though progress is likely slower the longer you’ve trained.
Next steps
Pick a protein target, plan four meals around it, lift three or four times a week and protect your sleep. For more on spreading protein, read Protein Needs After 40.
If you want help making the eating part automatic, try Proteinly: proteinly.io, our approach, and YouTube. Build the habit, build the body.