I've done fasts up to ten days. In a fast the body goes into ketosis as fat is released from the stores and used for energy. But at the same time the body is breaking down muscle. The Krebs cycle requires a small amount of glucose to keep it spinning. It gets the glucose from muscle tissue. So anything more than ten days and you begin to lose muscle mass. Also I found I did better if I took sodium in the form of bullion cubes dissolved in hot water. Without it, I eventually developed cramps.
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