Experts Warn Low-Protein Longevity Diets Raise Risks for Adults 65+
Updated
Updated · STAT · Aug 20
Experts Warn Low-Protein Longevity Diets Raise Risks for Adults 65+
3 articles · Updated · STAT · Aug 20
Summary
Nutrition specialists said cutting protein to extend lifespan could harm older adults, sedentary people and GLP-1 users, warning of faster muscle loss, more frailty, falls and higher mortality.
The pushback targets a new review of 350 studies that argued protein restriction may improve metabolic health and longevity, but critics said much of the evidence comes from animals and does not show longer human lifespan.
U.S. dietary guidelines released in early 2026 recommend 1.2 to 1.6 grams of protein per kilogram of body weight, while the RDA remains 0.8 grams; several experts said many older adults need more than the minimum.
GLP-1 weight-loss drugs heighten the concern because they already reduce muscle mass and metabolic rate, making adequate protein and activity more important for preserving lean tissue and independence.
Experts said the bigger goal is healthspan, not just lifespan, and favored individualized targets plus better protein sources—more beans and less bacon—over blanket restriction.