Human study · Exercise · 2 Aug 2026
Eating less protein could slow aging, major review finds
Source: ScienceDaily
What the research found
Commentary (review of >350 studies). Lamming and Knopf in Cell Press Blue argue that protein restriction can improve metabolism and nutrient sensing in animals, with FGF21 and branched-chain amino acids as candidate levers. Human trials of lower protein have shown fat loss and better fasting glucose in some sedentary adults, while older or training adults often need more protein to keep muscle. Updated U.S. ranges of 1.2–1.6 g/kg sit in tension with that animal longevity literature. Not a one-size diet and not a claim that protein powders treat aging. Needs vary with activity, pregnancy, and clinician advice.
Evidence level: Human study. A study in people, but an association isn't proof of cause.
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