Is there any relationship between blood group and diet?

No : No, there isn't. You are born with your blood type. Take care!

No: No relationship with these two things.

Some think so: Dr. Peter d'adamo has written several books about the "blood type diet:" http://www.Dadamo.Com/ I have tried it, but didn't find that it improved my personal well-being. However, it does help build people's recognition of need for a much more personalized approach to food, medicine, and overall health. People have different biochemical responses to medications, ; may get different side effects.