Weight Loss July 27, 2022 The Fast Metabolism Diet: Should You Try It? (4 of 5) Advertisement Phase 3 (days 5-7): moderate-carb, moderate-protein, high-fat Now we’ve reached the third phase. Here, Pomroy says you’ll kick your metabolism into high gear by adding healthy fats along with a moderate amount of carbs and proteins. Your fitness routine during this phase can include meditation and/or yoga. Next