Could Eating Less Protein Slow Ageing? Evidence in Humans Is Still Unclear

A review of 350 studies suggests reducing protein intake can alter energy use, enhance cellular cleanup, and lower ageing cell buildup in animals, which is linked to longer life; human evidence is limited and short-term, so it’s not clear if cutting protein extends lifespan in people. Higher-protein diets can help preserve muscle in older adults, especially with exercise. Longevity also depends on diet quality and lifestyle factors beyond protein, such as the Mediterranean pattern and overall healthy habits, so current protein guidelines remain sensible.