The Claim
Resistance training during caloric restriction is associated with an increase in fat-free mass in both men and women, while aerobic exercise and no exercise during caloric restriction are associated with a decrease in fat-free mass.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
During calorie restriction, people who do resistance training maintain or gain fat-free mass, while those who do aerobic exercise or no exercise lose fat-free mass.
See the scientific wording
Resistance training during caloric restriction is associated with an increase in fat-free mass in both men and women, while aerobic exercise and no exercise are associated with fat-free mass loss.
When muscles are pulled hard during weightlifting, special sensors in the muscle fibers detect the force and turn on a molecular switch that tells the cell to build more muscle protein. Even when the body is low on energy from dieting, this switch stays on, so muscles grow instead of breaking down. The extra muscle also burns more fat, helping the body lose fat without losing muscle.
What the research says
1 studyStudy: Resistance training as a key strategy for high-quality weight loss in men and women
When people diet, those who lift weights often gain muscle, while those who do cardio or sit still tend to lose muscle—even if they lose the same amount of total weight. This study proved it by measuring muscle changes directly.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.