Methionine tuning for health without frailty.

Garrido, Amanda; Price, Nathan L; de Cabo, Rafael · Cell Metab · 2026

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Abstract

Dietary protein quality, not merely quantity, shapes metabolic health and aging trajectories. Fanti et al. show that moderate methionine supplementation to a low-protein, Mediterranean-inspired diet activates a GH-GLP-1-FGF21 axis that reduces adiposity and frailty without caloric restriction; their findings provide a mechanism for why traditional plant-rich diets may promote longevity while sometimes compromising physical robustness.

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