# Narration and storyboard draft: Protein Intake and Muscle Function in Older Adults

Authored draft, approximately 60–90 seconds; no rendered video claimed.

More protein is not a single guarantee of stronger muscle with age. Some nutritionally vulnerable older adults gain selected functional benefits from higher intake. Other well-controlled trials find little added benefit, even when protein intake is increased above the adult allowance. Our HSEF v5.3 clinical claim reaches Ε, context-specific causality established, with Moderate confidence. Acute muscle protein synthesis, lean tissue and strength are distinct outcomes. A protein supplement can move a body-composition measure without improving gait or strength, and physical function can improve without measured mass gain. Resistance training is a major causal stimulus, so its benefit must not be assigned to a supplement when both change together. Vitamin D, leucine and energy are also often bundled. The review examines 56 original reports, including mechanism and boundary studies, rather than 56 pure protein efficacy trials. Consensus helped compare named trials and identify retrieval errors, including confusion about CALM and missing nutrition-only positive results. Original studies determine the assessment. Direct protein and exercise evidence during medication-assisted weight loss remains a research need; lean-mass decline alone does not diagnose sarcopenia. A useful next trial would match calories and ingredients, verify achieved intake, define nutritional status before outcomes, and make strength or physical function the primary measure.

1. Show the exact claim, grade and confidence.
2. Show selected publication milestones; label experimental systems and clinical endpoints.
3. Contrast the strongest result with its source-specific limitation.
4. End with the boundary experiment and primary-source links.

Use authored schematics; do not depict Consensus meters as causal confidence or reproduce publisher graphics without appropriate permission.