That's actually not true. There have been many studies where fasting for three days is healthy for you. Not all the time of course, but if you did it every once in awhile, it helps to reset your body. Your body will actually use up all the carbs you had stored then starts using fat as energy. My hubby fasts for three days once a month. If anyone is interested, look up Dr. Berg on youtube. I don't agree with everything he says but he's pretty smartThat’s not only “not the best” but extremely dangerous plus won’t work anyway cause your body will just start storing everything if it’s not getting enough.