The Claim
In healthy adults over 65 years of age, daily supplementation with 40 grams of whey protein for one year, without resistance training, has no significant effect on quadriceps muscle size, lower extremity strength, or functional capacity compared to carbohydrate supplementation.
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 adults over 65, taking 40 grams of whey protein daily for a year without doing strength training does not change the size of the quadriceps muscle, leg strength, or physical function compared to taking carbohydrate supplements.
See the scientific wording
In healthy adults over 65 years of age, daily supplementation with 40 grams of whey protein for one year, without resistance training, has no significant effect on quadriceps muscle size, lower extremity strength, or functional capacity compared to carbohydrate supplementation.
Muscle fibers grow larger and stronger only when they are pulled with enough force during movement; this force triggers a molecular switch inside muscle cells that tells the cell to build more contractile proteins. Without this pulling force, even large amounts of protein do not activate this switch, so muscles stay the same size and strength.
What the research says
1 studyTaking 40 grams of whey protein every day for a year didn't make older adults stronger or build bigger leg muscles — unless they also did weight training. Without exercise, the protein made no difference.
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.