In this Episode I chat with Dr. Bill Campbell about some of the work that he's been doing in the Performance & Physique Enhancement Laboratory at the University of South Florida. We chat about flexible vs rigid dieting and if one is better than the other for physique outcomes. We also touch on refeeds and diet breaks and if they are worthwhile adding into your dieting phases. For a free 7 Day Natural Bodybuilding prep course go to: https://members.healthmastery.co/optin1592314349648 For 1:1 Bodybuilding coaching: www.Healthmastery.co My Instagram: https://www.instagram.com/adammc192/ Bill's: https://www.instagram.com/billcampbellphd/?hl=en Timestamps 00:00 Intro 02:55 Bill’s background 08:55 What does IIFYM mean? 10:30 Flexible vs rigid dieting study 14:45 What were they expecting to find? 18:03 Do Phytonutrients impact body composition 24:15 Does flexible dieting improve post diet outcomes? 28:50 Do refeeds help maintain lean body mass? 36:50 Are there benefits of diet breaks? 42:50 Why do IFBB pros often follow a clean eating approach? 45:00 Bill’s dream research