Randomized Trialhigh evidence
Effects of a self-selected vegetarian vs. omnivorous diet on protein intake and muscle mass in older adults during resistance exercise: the IMPACT randomized controlled trial.
The American journal of clinical nutrition·September 22, 2026·PMID 42772454
Why it mattersOlder adults adopting plant-based diets may struggle to meet protein targets, potentially compromising muscle adaptations to resistance training. This trial quantifies the gap in protein intake and muscle mass gains between self-selected vegetarian and omnivorous diets under real-world counseling conditions.
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