Lifting protects muscle during fat loss

Binmahfoz et al. (2025, BMJ Open Sport & Exercise Medicine, PMID 40909191) found that combining resistance exercise with dietary weight loss improved fat-mass loss, protected fat-free mass, and improved muscle strength compared with diet alone in adults living with overweight or obesity. The study did not show a meaningful extra drop in total bodyweight, which is why the practical win is better body composition rather than a faster scale drop.

The review included cardiometabolic outcomes, but the clearer and more reliable signal was for body composition and strength: more fat-mass loss, better fat-free-mass protection, and stronger muscle performance. Treat cardiometabolic changes as a possible benefit that still depends on the whole plan, not as the main promise of lifting during weight loss.

Yes. Scale weight only tells you total mass. During dietary weight loss, resistance exercise gives your body a reason to keep muscle and strength while the calorie deficit pulls from stored fat. That is why a smart diet phase tracks strength, waist measurements, photos, energy, and consistency alongside bodyweight.

During a diet phase, lifting may not make the scale drop faster, but it can improve fat-mass loss, protect fat-free mass, and preserve strength. Keep the plan simple: lift two to four days per week, keep protein high enough to support training, avoid crash-dieting, and judge progress by strength, measurements, and how clothes fit instead of scale weight alone.

The strongest findings were body composition and strength outcomes. The review did not show that resistance exercise makes the scale drop faster, fixes every cardiometabolic marker, or guarantees the same response for every person living with overweight or obesity.