In the early 1900s the tapeworm diet started to be advertised. Dieters would swallow beef tapeworm cysts, usually in the form of a pill. The theory was that the tapeworms would reach maturity in the intestines and absorb food. This could cause weight loss, along with diarrhea and vomiting.
Once a person reached their desired weight they then took an anti-parasitic pill which, they hoped, would kill off the tapeworms. The dieter would then have to excrete the tapeworm, which could cause abdominal and rectal complications. It was risky in many ways. Not only can a tapeworm grow up to 30 feet (9m) in length, they can also cause many illnesses including headaches, eye problems, meningitis, epilepsy and dementia.
