A few months ago, I interviewed today's podcast guest - a former professional triathlete and now one of the most respected icons in health and fitness - in one of our most popular episodes of the year, entitled "" His name is Mark Sisson, and Mark just released a brand new, excellent book entitled: "". In today's podcast episode, we take a deep, deep dive into principles, practices and concepts you've probably never before heard when it comes to ketosis. Mark is also . His blog, , has paved the way for Primal enthusiasts to challenge conventional wisdom's diet and exercise principles and take personal responsibility for their health and well-being. Mark, has a BA in biology from Williams College and is a former world-class endurance athlete, with a 2:18 marathon and a fourth-place finish in the Hawaii Ironman World Triathlon Championships to his credit. Today, Mark directs his competitive energies into high-stakes Ultimate Frisbee tournaments against competitors decades younger. Besides blogging daily, Mark conducts seminars on the Primal Blueprint way of life and hosted 9 multi-day total immersion retreats called PrimalCon at locations across America and in Mexico from 2010-2014. He operates Primal Blueprint Publishing in Malibu, CA, publishing his own titles as well as work from other authors promoting ancestral health principles. Mark is married to Carrie and they have two children. Before jumping into this podcast, please realize that I already have several articles and podcasts I recorded in the past about the basics of ketosis. You can find all those in the resources section below.   During our discussion, you'll discover:   -How Mark took the the ketogenic diet, which has a reputation for being relatively restrictive, and instead presents a unique two-step, scientifically validated approach for going keto the right way...[7:40]   -Why Mark highly recommends you spend 21 days low-carb before switching to 6 weeks of ketosis...[11:30]   -How long does takes to get back into ketosis after a "carb binge"...[31:00]   -How something called "myogens" actually allow you gain lean muscle mass while on a ketogenic diet...[32:30]   -What Mark thinks about some people saying that ketosis might diminish metabolic flexibility in some people by promoting physiological insulin resistance...[40:30]    -Whether a cup of coffee is technically "breaking" a fast...[48:50]   -How ketosis can reprogram your genes and increase longevity...[54:55]   -Mark's favorite keto breakfast, favorite keto lunch and favorite keto dinner...[63:10]   -What Mark eats before ultimate frisbee...[67:40]   -Mark's take on testosterone replacement therapy (TRT) and why he personally uses it...[69:40]   -And much more...   Resources from this episode:   My previous articles and podcasts on ketosis:  -     -   -   -   - Show Sponsors:  -ZipRecruiter - Post jobs on ZipRecruiter for FREE by visiting . -Human Charger - Go to and use the code BEN20 for 20% off. -Human Charger - Go to purchase Kion Lean - the best supplement for longevity and fat loss! -Oak - Meditation & Breathing -  Go to now to download the app, completely FREE. Do you have questions, comments or feedback for me or Mark about today’s episode? Leave your thoughts at and be sure to check out Mark’s new book "".