Is it true eating for your blood type can be beneficial ?

No Blood Type & Diet: There is No relationship between blood type and weight loss, gain or diet. A long time ago a book was written telling people to eat for their blood type, however, this has proven over time not to be true. If you are overweight eat a healthy diet with lower overall calories and avoid high glcyemic index carbs (rice, pasta, potatoes, some beans, sugar) and your hunger & weight will decrease.