Representatives of the I blood group – the most ancient and widespread – Adam calls the consumers of meat from persistent digestive tract, an overactive immune system and poor adaptation to new diets. Holders of I blood group is difficult to digest dairy products and grains. Among the products that reduce weight for the I blood group, the author emphasizes meat, liver and seafood. Winners ii (A) blood group is called Peter D'Adamo "Farmers". Their ancestors lived on since ancient times that were grown on the land, and representatives of the Group ii blood include, for Adam, a vegetarian with a sensitive digestive tract. The body is adapted to their consumption cereal and vegetable crops. The meat is very difficult to digest and is deposited in fat and zashlakovyvaet body. Dairy products are the representatives of Group ii blood is also very poorly absorbed. Among the products that reduce weight for Group ii blood Adamo highlights vegetable oils, soy products, vegetables, pineapple. Winners iii (B) blood group – "Nomads" Adamo warns against use of most cereals, soybeans, chicken, tomatoes and pomegranates. Recommended to consume milk, all dairy products, fish, lamb, rabbit and flaxseed oil. Products, reduces weight, Adamo called red meat, liver, dairy products, eggs, green vegetables. Representatives of the iv (AB) blood – the "new people" – they eat mostly dairy products, lamb, venison, fruit and vegetables. Group iv blood was the result of mixing of other groups. People with the Group IV-resistant immune system and a sensitive digestive tract.