Dietary Protein Intake: Sarcopenia Defense (1.6-2.2g/kg) vs. mTOR Longevity Suppression (0.8g/kg)
Should longevity protocols prescribe high dietary protein to maximize skeletal muscle preservation and prevent frailty, or should protein (specifically leucine and methionine) be restricted to avoid chronic mTORC1 stimulation and accelerated biological aging?
Position A: High Protein (1.6-2.2 g/kg/day) for Sarcopenia Defense
Camp ADr. Gabrielle Lyon
Institute for Muscle-Centric Medicine
Skeletal muscle is our primary metabolic sink and the greatest predictor of survival under acute medical stress. Sarcopenia and falls represent leading causes of geriatric morbidity and death. Due to anabolic resistance in adults over 40, threshold leucine intake (~2.5-3g per meal) and 1.6-2.2g/kg/day protein is mandatory to stimulate muscle protein synthesis and maintain lean mass.
Position B: Protein/Amino Acid Restriction (<0.8-1.0 g/kg/day) for Autophagy
Camp BDr. Valter Longo
USC Longevity Institute
Epidemiological data (e.g. NHANES III) demonstrates that high protein intake in middle-aged humans (50-65) is associated with a 4-fold increase in cancer mortality and 75% increase in overall mortality, mediated by elevated IGF-1 and chronic mTOR activation. Restricting protein until age 65 maximizes cellular maintenance and autophagy, after which protein can be moderately increased.