Why don't fad diets work long term?

Why don't fad diets work long term?

Andrea Giancoli (Registered Dietician ) gives expert video advice on: How many Americans are on a diet?; What is a 'fad diet'?; Why are fad diets popular? and more...

Fad diets don't work long-term, because they are generally structured to be a quick fix. They're almost always very restrictive in calories or restricted in certain types of foods. They're very hard to follow in the long term. And once you stop that fad diet, you usually gain the weight back.