The Study
A 4-week caloric restriction with high volume resistance-training and high-protein diet does not increase fat-free mass sparing but increases strength.
This study compared two ways of lifting weights while eating less food, and found that doing more sets made people stronger — but didn’t help them keep more muscle. It’s like testing two different diets to see which one helps you run faster — it shows one might help, but doesn’t prove it for everyone.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
When people who already lift weights cut calories a lot and eat lots of protein, doing more sets of lifting doesn't stop them from losing muscle—but it does make them stronger anyway.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 546 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes—this means you can get stronger during dieting without gaining muscle, likely from better nerve-muscle coordination, not bigger muscles.
- 2Everyone lost about 4.2 kg body weight and 3.7 kg fat.
- 3Muscle mass stayed the same in both groups.
- 4The high-volume group (30 sets/week) got much stronger on chest press, right leg press, and left leg press.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
European journal of clinical nutrition
Year
2026
Authors
Samir Nait-Yahia, Mikael F. Kanaan, Noémie Beauregard, Merissa Jade Anderton, A. Duval, Éric Doucet
Related Content
Claims (10)
When resistance-trained people reduce their calorie intake by 40% for four weeks and eat 2.3 grams of protein per kilogram of body weight, they still lose fat-free mass, no matter how much they train.
Among trained individuals on a calorie-restricted, high-protein diet for four weeks, performing 30 sets per muscle group per week leads to greater gains in maximum strength for chest press and leg presses than performing 12 sets per muscle group per week.
In trained individuals who lose weight while doing high-volume resistance training, strength gains occur even when muscle mass does not increase, indicating that improvements in nervous system coordination or learning of movement patterns contribute to the strength increase.
In resistance-trained individuals, following a 4-week diet with 40% fewer calories, 2.3 grams of protein per kilogram of body weight, and resistance training leads to a loss of about 4.2 kg of body mass, 3.7 kg of fat mass, and a 3.5% reduction in body fat percentage, regardless of how much training is done.
During calorie restriction combined with high-volume resistance training, strength gains happen without an increase in muscle mass, and these gains are due to improvements in nervous system efficiency or movement technique, not muscle growth.
When resistance-trained people reduce their calorie intake by 40% and eat 2.3 grams of protein per kilogram of body weight per day, they still lose fat-free mass, no matter how much they train.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.