My doc explained it to me this way:
When you fast, your body isn't getting the vitamins, minerals, carbs and energy it needs to do work. That's OK if you're in a coma, but not so hot if you're actually walking around.
There's a myth that fasting cleanses the body of toxins. Totally, completely untrue. On the contrary, the only way to clean one's body of toxins (well, ones that CAN be cleansed... mercury, for instance, is in you for the rest of your life, the body has no way of disposing of it) is through intake of nourishment.
There's some evidence to suggest that levels of toxins in one's body actually becomes more dangerous during a fast, because the toxins that are bound up in body tissues start to get used up to operate the body. If there isn't any fuel being ingested, the body will start to burn its own reserves. If there are toxins in the reserves - in fatty tissue, or example - then they get used too.
But don't take my word for it. Talk to your doctor. A proper, medical doctor, not someone who has an "herbal agenda" to sell.
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