As every individual has his own personality so does he has his own choices and opinions in his life. So the eating practice is different for different people. You must have seen some pure vegetarian guy who follows his religion eating non-veg also. This is particularly because of his blood type and the demand from his body. People with blood group O mainly eat non-veg food as their stomach has more of acid content where as people with blood group A should always prefer to eat fresh fruits and vegetables. People who have blood group B can try anything in their eating habit except for chicken and people with blood group AB can enjoy any pattern of food without any problem.