What is "fad diets"? What can be the examples of this?

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Rebecca
A "fad" refers to a trend which is widely popular among people for a short time. Thus, a "fad diet" is a diet which is very common and promoted by lots of people, but never actually stays a popular diet because it is not really the best way to eat and lose weight. Ex: I was worried it was just another fad diet but it actually works.