Robert Santana is a Starting Strength Coach and a Registered Dietitian who currently trains clients out of the Revolution Training Systems in Tempe, AZ. Brett and Robert get deep into the weeds of macronutrients, how we should eat to lose weight, and what our diet/exercise regimen should look like if we're trying to gain muscle.

Peter Attia is is the founder of Attia Medical, PC, a medical practice with offices in San Diego and New York City, focusing on the applied science of longevity.

Dr. Rhonda Patrick is a Ph.D in biomedical science and expert on nutritional health. Her podcasts and other videos can be found at http://FoundMyFitness.com This is a dense one. Joe and Rhonda discuss all things nutrition and how it relates to pregnancy, why you should really just drop refined sugar completely, child vaccinations, the microbiome and