Body recomposition: tracking it when the scale won’t move
Fat out, muscle in, weight the same. The scale can’t see a recomp. Your tape measure and camera can.
Same weight, different body
Muscle is about 18% denser than fat. Move the sliders and compare what the scale reports with how much space you actually take up.
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Densities used: adipose tissue ≈ 0.90 kg/L, skeletal muscle ≈ 1.06 kg/L, the values used in classic body-composition models.
How body recomposition works
You lose fat when you take in less energy than you burn. You build muscle when training gives a reason to and protein supplies the material. Doing both at once sounds contradictory, but your body can draw on stored fat for energy while using dietary protein to repair and grow trained muscle, especially when that muscle is new to training.
The recomp recipe
- Lift hard, progressively. Three to five full-body or split sessions a week, adding weight or reps over time.
- Eat near maintenance. A small deficit (10–20%) or maintenance. A big deficit starves muscle growth.
- Protein every day. Around 1.6–2.2 g per kg of body weight, the range supported by the 2018 Morton et al. meta-analysis in the British Journal of Sports Medicine.
- Sleep. Seven to nine hours. Short sleep shifts weight loss toward muscle, not fat (Nedeltcheva et al., 2010).
How to track a recomp (the part most people get wrong)
If you only weigh yourself, a successful recomp looks like three months of nothing. Track three signals instead:
- Waist down, limbs steady or up. Log your waist, arms, chest and thighs every 2–4 weeks in the measurement tracker. Recomp shows up as a falling waist with flat or rising arm and thigh numbers.
- Photos under identical conditions. Same light, distance and time of day. How to take them, then compare them with a ghost overlay.
- A flat-ish 7-day weight average. In the weight tracker, a trend within ±0.1 kg a week while the waist shrinks is the recomp signature.
Every couple of months, run your tape numbers through the Navy body fat calculator and FFMI calculator: body fat % should fall while FFMI rises.
Questions people ask
What is body recomposition?
Body recomposition (“recomp”) means losing fat and gaining muscle at the same time, so your body composition improves even if your weight stays roughly the same.
Who can recomp?
It works best for people new to lifting, people returning after a break, those with higher body fat, and anyone who has been under-eating protein. Well-trained, lean lifters usually progress faster with separate cut and bulk phases. A 2020 review by Barakat and colleagues in Strength and Conditioning Journal concluded recomposition is achievable in trained people too, just more slowly.
How do I do a body recomp?
Lift with progressive overload three to five times a week, eat around maintenance or a small deficit (about 10–20% below maintenance), get roughly 1.6–2.2 g of protein per kg of body weight daily, and sleep seven or more hours. Be patient: think months, not weeks.
How do I know if my recomp is working?
Not from the scale alone. Look for a shrinking waist with steady or growing arm, chest and thigh measurements; rising strength; and visible change in same-conditions progress photos taken four or more weeks apart.
Why does muscle “weigh more” than fat?
A kilo is a kilo, but muscle is denser: roughly 1.06 kg per litre versus about 0.9 kg per litre for fat. The same weight of muscle takes up around 15% less space.