Creator of this diet, Dr Peter D'Adamo, believes your blood type influences how you lose weight. He's devised four different diets for each blood group. The diet has been criticised by medics for being ineffective.

Celebrity fan: Martine McCutcheon

What is it?

The Blood Type Diet works on the theory your blood type affects how your body breaks down and deals with different foods.

The creator of the diet, Dr Peter D'Adamo, has created four specially tailored diets for different blood types. By following the right one for you, Dr D'Adamo claims you'll lose weight faster, feel healthier and possibly even lower your risk of certain diseases.

• Next: How does the Blood Type Diet work?

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