The Prolinn Diet (Last Chance Diet)
This diet is kind of like SlimFast in that you substitute a specially formulated drink for your meals, but unlike SlimFast, which just tastes like it's made from slaughterhouse byproduct, the Prolinn drink actually contains animals bones, tendons, horns, and hooves. It was designed to be a miracle weight-loss solution, but because it contained few calories and zero nutrients, at least 50 people who fasted and only consumed the stuff in the 1970s suffered heart attacks.
The Breatharian diet
Breatharians believe the human body needs zero sustenance (even water, in some cases) and can rely solely on air alone -- with their existence supplemented by prana, the main life source in Hindu tradition. In a segment aired on 60 Minutes, a woman claiming to be a practicing Breatharian tried to prove its validity. After four days of living of prana alone, the test was called off because the woman showed severe red flags like slurred speech, dilated pupils, and severe dehydration... which surprised no one.
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Wil Fulton is a staff writer for Thrillist. He always avoid swamps, for reasons unrelated to weight. Follow him: @wilfulton.