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How is your weight loss going?The clinical trials are overwhelmingly convincing at this point.
It's not so much "necessary" (few things are), as it's beneficial for the brain and the body.
In his latest book, Dr. David Perlmutter recommends everybody do a 72-hour fast once every 3 months. He's a neurologist.
They're now testing fasting for cancer and alzheimer's.
Your body is hungriest when you've depleted your liver glycogen. That's the short-term batter in your body -- about 1,500 calories can be stored. Once that's gone, your liver starts turning body fat (long-term energy) into ketones and sugar for energy.