How much protein do you need in a calorie deficit?
In a calorie deficit, the literature typically cites higher protein intakes than during maintenance — often in the range of 2.0 to 2.4 grams per kilogram of fat-free mass.
Protein calculator
Evidence-based range per the ISSN position stand (Jäger et al., 2017).
Why protein needs rise in a deficit
When calories are restricted, the body increasingly taps its own protein structures for energy. A higher protein intake reduces that breakdown. In their systematic review of natural dieting in athletes, Helms et al. (2014) analyzed intakes of 2.3 to 3.1 g/kg of fat-free body mass, depending on the size of the deficit and the athlete’s body fat percentage.
The controlled evidence
In a randomized intervention trial, Longland et al. (2016) compared two groups in a steep calorie deficit: 1.2 g/kg versus 2.4 g/kg of protein, with identical strength training. Individual intervention studies have shown differences between higher and lower protein intakes under certain conditions.
| Deficit | Protein target |
|---|---|
| Moderate (300–500 kcal) | 1.8–2.2 g/kg |
| Aggressive (> 500 kcal) | 2.2–2.6 g/kg |
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- Helms, E. R., Aragon, A. A., & Fitschen, P. J. (2014). Evidence-based recommendations for natural bodybuilding contest preparation: nutrition and supplementation. JISSN, 11:20. jissn.biomedcentral.com
- Longland, T. M., et al. (2016). Higher compared with lower dietary protein during an energy deficit combined with intense exercise promotes greater lean mass gain and fat mass loss. Am J Clin Nutr, 103(3). PubMed
- Pasiakos, S. M., et al. (2013). Effects of high-protein diets on fat-free mass and muscle protein synthesis following weight loss. FASEB J, 27(9). PubMed
- Jäger, R., et al. (2017). ISSN Position Stand: Protein and Exercise. JISSN, 14:20.