Lean mass guide
How to Preserve Lean Mass While Losing Weight
Use lean mass tracking, protein intake, resistance training, and moderate calorie targets to reduce muscle loss while dieting.
Last updated: · Reviewed by the Lean Mass Calculator editorial team
Who this page is for
People losing weight who want more of the loss to come from fat instead of lean tissue.
Start with the main lean mass calculator, then use the related tools below when you need body fat, FFMI, protein, or calorie context.
The main levers
Resistance training, sufficient protein, sleep, and a moderate calorie deficit are the biggest practical levers for preserving lean mass.
Aggressive deficits can work short term, but they increase the need for careful training recovery and protein consistency.
How to track progress
Watch trend weight, waist, training performance, and estimated lean mass together. One metric alone can mislead you.
If strength, energy, and lean mass estimates all fall quickly, your deficit may be too aggressive or recovery may be too low.
Frequently asked questions
How much protein preserves lean mass?
Research often supports higher protein during dieting, commonly around 2.3-3.1 g/kg lean body mass for lean trained people.
Do I need to bulk after preserving lean mass?
Not necessarily. If your goal is fat loss, maintaining lean mass during the cut is already a strong outcome.
Sources & references
The estimates on this page use published lean body mass equations and clinical reference ranges. See the full reference charts on the lean body mass chart hub.
- Estimated lean body mass as an index for normalization of body fluid volumes — Boer P, American Journal of Physiology (PubMed) (1984)
- Percent Body Fat Norms and Reference Ranges — American Council on Exercise (ACE)
- Body Composition — Reference Information — National Institutes of Health (NCBI Bookshelf)