I've calorie counted, I've yo-yo dieted, I've gone low-carb, I've fasted, and I've spent a LOT of time in ketosis. I dropped 121 pounds on a high-fat diet. Fast-forward 9 years and I've regained the majority of that weight. So, what happens when I cut the dietary fat and ramp up my carbohydrate intake? That's what I'm going to find out...