Is Protein Intake good for metabolic health?

The evidence points that way, though it's not yet conclusive. Multiple systematic reviews, meta-analyses, and expert position papers (including PROT-AGE and ESPEN guidelines) consistently support higher dietary protein intake for preserving muscle mass and function in older adults, particularly to counteract sarcopenia and protect lean mass during weight loss. That's reflected in an evidence score of 58/100 for its role in metabolic health, drawn from 6 studies, with an estimated impact on longevity rated moderate (55/100).