One of the popular fad diets in Hollywood was the grapefruit diet. It dates back to the’30s, and many Hollywood stars of the time swore by it. It remained popular until the mid-1970s, when it became one of the diets that was sent from fax machine to fax machine, creating a phenomenon known as xerox lore. The diet is credited to the Mayo Clinic, which clearly states that it has nothing to do with the diet and that this diet is not healthy.