topicEssential Amino Acids Muscle Protein Synthesis Randomized Trial
claim6 [13] [14] [15] 20 11 18 11 Sarcopenia and age-related decline in skeletal muscle mass and function are major determinants of frailty, disability, and reduced quality of life in older adults [,,,,].
evidence level2
citationSumi Koichiro (2026)
sourceFasting plasma amino acid profiles after resistance exercise with or without nutritional supplementation in older adults: an exploratory analysis of secondary outcomes from a randomized controlled trial
topicEssential Amino Acids Muscle Protein Synthesis Randomized Trial
claimThe previously reported randomized controlled trial underlying the present work showed that low-dose dairy protein plus micronutrient supplementation during resistance exercise improved lean mass outcomes compared with exercise alone in community-dwelling older adults [].
evidence level2
citationSumi Koichiro (2026)
sourceFasting plasma amino acid profiles after resistance exercise with or without nutritional supplementation in older adults: an exploratory analysis of secondary outcomes from a randomized controlled trial
topicEssential Amino Acids Muscle Protein Synthesis Randomized Trial
claim2 22 19 11 Although intervention studies usually focus on body composition and physical performance, emerging evidence suggests that fasting plasma free amino acid profiles may provide complementary information on whole-body amino acid handling, muscle-related phenotypes, and nutritional status in older adults under relatively steady-state conditions [,].
evidence level2
citationSumi Koichiro (2026)
sourceFasting plasma amino acid profiles after resistance exercise with or without nutritional supplementation in older adults: an exploratory analysis of secondary outcomes from a randomized controlled trial
topicEssential Amino Acids Muscle Protein Synthesis Randomized Trial
claimResistance exercise is a key strategy to preserve muscle health, and combined exercise-nutrition approaches are often more effective than exercise alone, although the certainty and magnitude of benefit vary across studies [,].
evidence level2
citationSumi Koichiro (2026)
sourceFasting plasma amino acid profiles after resistance exercise with or without nutritional supplementation in older adults: an exploratory analysis of secondary outcomes from a randomized controlled trial
topicEssential Amino Acids Muscle Protein Synthesis Randomized Trial
claimLEAA mixtures are defined here as oral supplements containing all nine indispensable amino acids with about 40% or more leucine by weight; studies of leucine-enriched branched-chain amino acids, free leucine, and leucine-enriched protein are treated as indirect evidence.
evidence level4
citationNagao K (2026)
sourceLeucine-Enriched Essential Amino Acids in Clinical Practice: A Narrative Review.
topicEssential Amino Acids Muscle Protein Synthesis Randomized Trial
claimFunction improved when LEAA was combined with exercise, but exercise was given in all such trials, so the effect of LEAA alone is unclear.
evidence level4
citationNagao K (2026)
sourceLeucine-Enriched Essential Amino Acids in Clinical Practice: A Narrative Review.
topicEssential Amino Acids Muscle Protein Synthesis Randomized Trial
claimEvidence for long-term benefits that patients can feel is still limited, and safety has not been assessed systematically.
evidence level4
citationNagao K (2026)
sourceLeucine-Enriched Essential Amino Acids in Clinical Practice: A Narrative Review.
topicEssential Amino Acids Muscle Protein Synthesis Randomized Trial
claimMuscle wasting driven by aging, chronic disease, or intensive exercise undermines mobility, metabolic health, and survival-yet the people who lose the most muscle are often those least able to eat more protein.
evidence level4
citationNagao K (2026)
sourceLeucine-Enriched Essential Amino Acids in Clinical Practice: A Narrative Review.