My body reacts well, I am quite experienced now. But what I find is that every extended fast (fasting longer than 3 days) is unique. In the first 48 hours as the carbs burn out it gets good and can be very challenging for many. They mistake the discomfort as hunger and starvation, which is not happening. Fasting is a clearing, healing, and a resting. He body feels so many things, a sharpening, a stengthing, and balancing. Eating constantly and the poor quality of foods, as we can see, does not serve humans well.