Older adults who ate extra protein while doing strength training for 8 weeks didn't get stronger or have better muscles than those who ate the usual recommended amount. The study found no advantage from the extra protein.
See the scientific wording
In community-dwelling older adults, consuming protein at approximately 1.6 g/kg/day during 8 weeks of resistance training does not result in greater improvements in physical performance or muscle quality compared to consuming the recommended protein intake.
Very strong evidence
Randomized trialsOne moderate-quality study supports this claim, so treat this as an early signal rather than settled science.
What the research says
1 study reviewedSupporting (1)
Randomized Controlled TrialHuman2022
The study found that older adults who ate extra protein during strength training didn't get any extra improvement in daily tasks like walking or getting up from a chair compared to those who ate the normal amount.
Contradicting (0)
No contradicting studies found yet
That doesn't mean it's settled — it just means no study has tested the opposite.
Quality-weighted scoring: we follow the GRADE framework — each study is rated High, Moderate, Low, or Very Low based on study design, methodology rigor, and risk of bias. A single high-quality RCT can outweigh several weaker observational studies.
Scores reflect study quality, not just count.
When people lift weights, the body gets the signal to build more muscle. The protein from food provides the building blocks. But once there are enough building blocks, eating more protein doesn't make the body build more muscle. So older adults who eat the normal amount of protein already have enough, and eating extra doesn't help.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting study
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Older adults who ate extra protein while doing strength training for 8 weeks didn't get stronger or have better muscles than those who ate the usual recommended amount. The study found no advantage from the extra protein.
Mechanism
1 studyThe training itself is what makes muscles stronger. The normal amount of protein gives the body all the materials it needs, so eating extra protein doesn't make the body build more muscle. So the extra protein doesn't lead to better performance or muscle quality.
When people lift weights, the body gets the signal to build more muscle. The protein from food provides the building blocks. But once there are enough building blocks, eating more protein doesn't make the body build more muscle. So older adults who eat the normal amount of protein already have enough, and eating extra doesn't help.
Resistance training activates signaling pathways within muscle cells that increase the rate of muscle protein synthesis, leading to muscle growth and functional improvements.
Dietary protein provides amino acids, especially leucine, which act as both building blocks and signaling molecules that further upregulate the mTOR pathway, stimulating muscle protein synthesis.
The anabolic response to amino acids is saturable; when amino acid availability exceeds a certain threshold, additional amino acids do not produce further increases in muscle protein synthesis.
In older adults with adequate habitual protein intake, the recommended protein intake already provides enough amino acids to saturate the post-exercise anabolic response, so additional protein does not yield extra muscle protein synthesis.
Consequently, improvements in physical performance and muscle quality are driven primarily by the training stimulus, not by exceeding protein requirements.
Evidence from Studies
Supporting (1)
Community contributions welcome
The study found that older adults who ate extra protein during strength training didn't get any extra improvement in daily tasks like walking or getting up from a chair compared to those who ate the normal amount.
Contradicting (0)
Community contributions welcome
Score Breakdown
No multi-axis breakdown available yet. The overall Pro / Against score above is the best signal.
- No clinical evidence is available; the score reflects mechanistic plausibility only.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
Randomized Controlled Trial Comparing 1.6 g/kg/day Protein to Recommended Intake During 8-Week Resistance Training in Community-Dwelling Older Adults
Double-blind, randomized, placebo-controlled trial with community-dwelling adults aged 60+ randomized to either 1.6 g/kg/day protein supplement or control (isocaloric placebo) for 8 weeks, all undergoing identical progressive resistance training. Primary outcomes: physical performance (e.g., gait speed, chair stand) and muscle quality (e.g., muscle mass via DXA, strength).
Systematic Review and Meta-Analysis of RCTs on Protein Supplementation During Resistance Training in Older Adults
Comprehensive search of databases for RCTs comparing higher vs. recommended protein intake during resistance training in adults ≥60 years. Meta-analyze outcomes of physical performance and muscle quality, assessing heterogeneity and publication bias.
Prospective Cohort Study of Habitual Protein Intake and Resistance Training on Physical Performance in Community-Dwelling Older Adults
Prospective cohort of community-dwelling older adults with baseline dietary protein intake (e.g., food records) and self-reported resistance training frequency. Follow-up for 1-2 years with repeated measures of physical performance and muscle mass.
Cross-Sectional Study of Current Protein Intake and Muscle Quality in Older Adults Engaging in Resistance Training
Cross-sectional sample of community-dwelling older adults (≥60) who perform resistance training. Measure protein intake via 24-hour recall or FFQ, assess muscle quality (e.g., DXA, ultrasound) and physical performance tests. Adjust for confounders.