20. Grapefruit
You may have heard of the grapefruit diet, which has been around longer than most fad diets. It dates back to the 1930s and comes in several variations.
But while its proponents claim that the fruit can help burn off fat, there has not been much evidence that it actually has fat-burning properties. It does, however, make a nutritious addition to your weight loss diet. Eating half a grapefruit or drinking a glass of its juice before your meal may help fill you up, encouraging you to eat less during your actual meal.
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