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2. Ketosis will begin
When your body loses the ability to break down new glycogen that enters the body, it starts to starve and go on a search for other things to convert into energy. It will start breaking down fat into fatty acids, using them for energy instead of carbs.
Again, this is not always a bad thing, especially if you’re using fasting as a method to lose weight if you are obese. The problem here is that the brain cannot use this broken down fat for fuel. Due to this, your brain turns to ketone bodies for energy. This works for a small time because ketone bodies can’t replace glucose.
After about four days these ketone bodies can begin to build up, forming acetone which is a volatile and reactive substance. When this happens, it can lower the pH of the blood, developing into a condition called acidosis that could lead to coma or death if not reversed.