The Claim
A diet providing 30% of energy from protein during energy restriction and exercise promotes lean mass gain in overweight premenopausal women, whereas diets with 15% protein lead to lean mass loss or maintenance.
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.
In overweight premenopausal women undergoing calorie restriction and exercise, a diet with 30% protein increases lean body mass, while a diet with 15% protein results in no gain or a reduction in lean body mass.
See the scientific wording
A diet providing 30% of energy from protein during energy restriction and exercise promotes lean mass gain in overweight premenopausal women, whereas diets with 15% protein lead to lean mass loss or maintenance.
When a person eats a lot of protein while losing weight and doing exercise, the amino acid leucine from the protein turns on a cellular signal that tells muscle cells to build more protein and stop breaking down existing muscle. This keeps muscle mass from shrinking and even makes it grow, even when the body is in a calorie deficit.
What the research says
1 studyWhen overweight women lose weight while exercising, eating more protein (30% of calories) helps them build muscle, while eating less protein (15%) doesn't help muscle grow—and can even make it shrink.
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.