For O blood type, the diet should should include higher doses of protein. Poultry, fish, lean meat, vegetables, nuts, beans, grains and dairy products. People with O blood type are more prone to stomach related issues. The diet recommends that people with type O blood should avoid pork (including ham and bacon), lentils, wheat, pickled herring, catfish, smoked salmon, coconut, eggplant, oranges, melons, potatoes and corn.
