Fad diets are types of weight-loss plans or eating patterns that gain popularity quickly but often have limited long-term success. These diets typically promote quick and drastic weight loss through specific food restrictions, unusual eating patterns, or extreme calorie restrictions. However, they are typically based on short-term, unbalanced, or potentially unhealthy approaches to eating, and their effectiveness and safety are often not backed by scientific evidence. Examples of fad diets include the Atkins diet, the keto diet, the cabbage soup diet, the grapefruit diet, and countless others that have come and gone over the years.
