Protein, Leucine & mTOR: Balance for Longevity 🧬💪 mTOR is a master growth switch. Leucine-rich protein (and insulin) turns it on—great for muscle, recovery, and metabolic health. Turning it down at times—via fasting, lower protein windows, polyphenols, or exercise-induced AMPK—supports cellular repair, autophagy, and lifespan (seen across multiple model organisms). The playbook isn’t “always on” or “always off.” It’s strategic cycling: • Hit a leucine threshold (~2–3 g) with 30–50 g high-quali