Seven diets that do not work for weight loss include the Paleo diet, which registered dietitian Mary Hartley says is almost impossible to replicate in modern times, and the gluten-free diet, which is not intended for people who want to shed some pounds. Hartley says there is no scientific data supporting diets by blood type, that "master cleanse" diets can slow metabolism and lead to binge eating, that the baby food diet is just silly, that the Dukan diet is too restrictive and that the raw-food plan is too difficult to stick with and has no evidence to support its health claims.

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