Single Food Diets or Few foods Diets
These are purely fad diets such as the grapefruit diet and the egg and tomato diet (which allows up to 6 hard-boiled eggs and six tomatoes a day!) These diets are deficient in essential vitamins and minerals and do nothing to improve eating habits. As a result, they are useless for weight loss and may be unhealthy.
Easy Weight Loss Due to Special Properties
In particular, beware those fad diets that promote a food because of it’s special properties (e.g. “fat-burning”) that supposedly cause easy weight loss. No single food has this type of weight-loss benefit and fat-burning is a myth.
The only reason that dieters lose weight on these fad diets is because either, the diet plan provides very few calories, or because the dieter becomes so bored with the monotony of the diet menu that they end up not eating enough to maintain their weight.
They are a waste of time. Avoid them.