On this episode of Health Theory with Tom Bilyeu, Mark Sisson explains how to tap into that primal lifestyle and live an awesome life where you enjoy what you eat, you don\u2019t have constant cravings, and you still burn excess fat and extend your longevity. He talks about the healing power of collagen, the crucial importance of metabolic flexibility, and why there\u2019s no need to sacrifice daily pleasure for good health. \n\nThis episode is brought to you by: \nButcher Box: For a limited time, new members can get 2 pounds of free ground beef in every Butcher Box order by signing up today at ButcherBox.com/impact \nWHOOP: For 15% off your order, go to https://www.whoop.com and use discount code HT at checkout.\xa0\nPATLive: Get 10% off your first year of service after a 14-day free trial. Visit patlive.com/impact Indeed: Go to Indeed.com/IMPACT for a FREE $75 credit to boost your job post. \n\nSHOW NOTES:\xa0\nMark wants people to be pain-free, to enjoy their food, to be able to move around easily [0:24] \nMark explains what fulfillment means to him [3:45] \nMark and Tom discuss the limits to how much fulfillment money can really buy [4:43] \nMark explains why he has evolved to embrace metabolic flexibility [7:54] \nYou don\u2019t need as many calories as you think you do [11:55] \nHow does diet change the number of mitochondria? [13:51] \nWhen your body gets good at burning fat, hunger and cravings start to disappear [19:54] \nThe brain\u2019s usage of calories throughout the day does not vary much [24:32] \nMark explains why animal protein is better than plant protein [28:21] \nMark talks about why you need to eat nose-to-tail for ligament health [31:51] \nMark explains why collagen peptides are so important [36:04] \nYou cannot get everything you need from a plant-based diet without supplements [39:07] \nMark argues that there is no one right answer for diet [44:03] \nMark is unwilling to sacrifice daily pleasure simply for marginal additional longevity [48:18] \nMark wishes he could spend the rest of his life eating peanuts and drinking beer [50:30] \nMark feels that the coronavirus pandemic has been utterly mismanaged [52:19] \nMark prioritizes Vitamin D over even exercise [56:45] \nMark and Tom discuss energy drinks and whether they work on a regular basis [1:01:43]\xa0\n\nFOLLOW MARK:\xa0\nWEBSITE: primalblueprint.com/\xa0\nINSTAGRAM: instagram.com/marksissonprimal/\xa0\nFACEBOOK: facebook.com/marksissonprimal/\xa0\nTWITTER: twitter.com/mark_sisson\xa0\n\nAre You Ready for EXTRA Impact?\nIf you\u2019re ready to find true fulfillment, strengthen your focus, and ignite your true potential, the Impact Theory subscription was created just for you.\nWant to transform your health, sharpen your mindset, improve your relationship, or conquer the business world? This is your epicenter of greatness.\xa0\nThis is not for the faint of heart. This is for those who dare to learn obsessively, every day, day after day.\nSubscription Benefits:\n\nUnlock the gates to a treasure trove of wisdom from inspiring guests like Andrew Huberman, Mel Robbins, Hal Elrod, Matthew McConaughey, and many, many, more\n\nNew episodes delivered ad-free\n\nExclusive access to Tom\u2019s AMAs, keynote speeches, and suggestions from his personal reading list\n\nYou\u2019ll also get access to an 5 additional podcasts with hundreds of archived Impact Theory episodes, meticulously curated into themed playlists covering health, mindset, business, relationships, and more:\n\n\nLegendary Mindset: Mindset & Self-Improvement\n\n\nMoney Mindset: Business & Finance\n\n\nRelationship Theory: Relationships\n\n\nHealth Theory: Mental & Physical Health\n\n\nPower Ups: Weekly Doses of Short Motivational Quotes\xa0\n\nSubscribe on Apple Podcasts: https://apple.co/3PCvJaz\nSubscribe on all other platforms (Google Podcasts, Spotify, Castro, Downcast, Overcast, Pocket Casts, Podcast Addict, Podcast Republic, Podkicker, and more) : https://impacttheorynetwork.supercast.com/\n\nLearn more about your ad choices. Visit megaphone.fm/adchoices