Great question! This is best advice to do buy the original and sub out meals for fasting then try to work up to it! is meant to mix up metabolism with 3 meal days, 2 meal days, one meal days (omad) and fasting. The fasting is every new member's biggest fear. You are allowed tea, coffee, water, broth, and electrolytes You should always listen to your body tho. If at anytime during a fast whether speed keto or regular you do not feel good. stop immediately.