it can harm your liver and dmage it perm if not kill you.
i have done extensive research of fasting and all deaths that occured from fasting came from two things: chemicals in the bloodstream that overworked the kdneys and liver sending the faster into organ failure. over exertion while on a Water Fast only. which you should only do for three days on your own without having a doctor check your blood for imbalances. (which is why i like to drink some juice every one in awhile on a water fast)