From the health expert and New York Times bestselling author of The Keto Reset Diet comes a groundbreaking ketogenic eating and lifestyle plan tailored for longevity, health, and happiness. At age sixty-six, ancestral health movement leader Mark Sisson is still in peak athletic condition and exceptional health. He credits his ketogenic diet and complementary lifestyle practices as the reason, and rightly so—research has confirmed the anti-aging benefits of following a high-fa