Whether they limit your calories, prevent you from pooping, suck all the protein from your body, or eventually kill you, Kate and Rick talk about all the fad diets through the ages.
Resources:
Diets through history: The good, the bad and the scary.
Popular fad diets through the years.
Woman starves to death in spiritual quest to live on sunlight alone.
Ancient humans mostly vegetarian, 'Paleolithic diet' critic says.