The Tapeworm Diet
Perhaps, the most disturbing diet of all is this one, which consists of taking a pill that contains a live tapeworm egg so it will eventually grow and eat what you eat.
This diet started in the Victorian era as a way for women to lose weight so they could achieve the ideal standard of beauty. They might have lost weight, but they probably also experienced things like diarrhea, abdominal pain, and even neurological problems.