priors.science/reviews/dietary-protein-and-muscle

Dietary Protein and Muscle

The current evidence on 6 claims, ordered from most established to most contested. Each score is the panel’s evidence certainty: how firmly the literature supports the claim as stated.

6claims tracked
55primary papers reviewed
26 Oct 2026latest evidence review
0 Established · 2 Likely · 3 Uncertain · 1 Doubtful  |  four-reviewer panel · PICO Framework
ClaimStandingEvidence certaintyCorpus
Plant and animal protein similar gainsSource And DistributionLikely82%10
Protein supplement aids training gainsTraining AdaptationsLikely72%13
Higher protein slows muscle loss in ageProtein And AgingUncertain62%14
No extra gain above 1.6 g per kgTraining AdaptationsUncertain62%12
Even meal distribution aids muscleSource And DistributionLong-standingUncertain55%12
Protein alone needs exercise in elderlyProtein And AgingDoubtful35%10
Track Dietary Protein and Muscle.
These claims are re-checked against new research as it is published. Track this topic for the full review, including each claim’s challenge and the papers behind it.
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Standing: what the evidence certainty means
Established≥ 85%Strong, consistent evidence. Unlikely to change.
Likely70–84%Well supported, with some gaps or indirect evidence.
Uncertain50–69%Mixed or limited evidence. Genuinely open.
Doubtful30–49%Little support; the weight of evidence leans against it.
Refuted< 30%The evidence contradicts it. Confidently false as stated.
A standing changes only when the score moves past a boundary by more than 4 points, the re-scoring noise floor; a score within 4 points of a boundary keeps its previous standing.
Where the evidence sits in time
Long-standingMost of this evidence is older than the rest of this field.