Contents [ hide ] What is a Blood Type Diet? Promise Can eating foods based on your blood type - O, A, B, or AB - help you lose weight and stay healthy? That is the view behind a blood transfusion, prepared by naturopath Peter J. D'Adamo. D'Adamo says the food you eat responds chemically to your blood type. If you follow a diet designed for your blood type, your body will digest food properly. You will lose weight, have more energy, and help prevent infections. What to eat That depends on your blood type. Here is what D'Adamo recommends for each type: Type blood O : High protein foods for lean meats, poultry, fish, and vegetables, and light grains, beans and milk. D'Adamo also recommended various supplements to help with stomach problems and other issues that people with type O often experience. Type blood A : Vegetable foods based on fruits and vegetables, beans and whole grains, and whole grains - that is, natural and fresh, because D'Adamo says that people...