What's the key to longevity? According to Valter Longo and his bestselling book, The Longevity Diet, it's a combination of fitness and a mostly plant-based diet. That in itself isn't groundbreaking by any means, but what is unique about Longo's approach is the regular fasting element.  In today's episode, Matt and Doug walk through the tenets of Longo's philosophy, and Matt shares his recent experience completing a 5-day Prolon fast.