The role of protein quality and amino acid composition in preventing sarcopenia and functional decline in older adults.
Level 5 - mechanism / opinion, no new human data
Narrative review without systematic methodology or primary data synthesis
PubMed 42180570 · doi:10.3389/fnut.2026.1817891
What was done
This narrative review analyzed the literature on dietary protein quantity, protein quality, essential amino acid composition (specifically leucine), mealtime protein distribution, and adjunct nutritional supplements (creatine, vitamin D, collagen, omega-3 fatty acids) alongside resistance exercise for preventing sarcopenia and age-related functional decline in older adults.
What was found
The abstract reports no numerical values or quantitative effect sizes. It qualitatively describes that standard protein recommendations may be inadequate for older adults, who require higher doses distributed across meals to stimulate muscle protein synthesis. It notes that leucine plays a central role in activating anabolic pathways, animal proteins provide higher bioavailability and complete amino acid profiles than single plant sources, and dietary supplements combined with resistance training support muscle maintenance.
Why it matters
It emphasizes the importance of protein source quality, amino acid distribution, and co-interventions like resistance training rather than just total daily protein quantity for older adults.
Limits
As a narrative review, it lacks a systematic search protocol, study selection criteria, risk of bias assessment, and quantitative synthesis. The abstract provides no specific quantitative recommendations, sample counts, or statistical results.
Cited by
- supports Leucine is required to stimulate muscle protein synthesis, while trace minerals are necessary for hair synthesis and growth.