IIFYM - if it fits your macros - was an eating system developed to allow greater diet flexibility - but does it jive with everyone's lifestyle? Are there other flexible approaches that can work? Also can body composition and weight changes occur in the opposite direction of caloric intake? Can changes in macronutrient intake alone influence body composition without changing calories? Brian discusses all these topics and brings to the table case studies to back up his comments. As Precision Nutrition always brings, Brian also provides great insights on the art of coaching clients in with real world tactics. Brian also takes a couple listener questions! This is part 1 of 2 of this interview - stay tuned for part 2!