What’s the deal with eating for your blood type?

This author purports that an individual’s blood type should determine what foods to eat and which ones to avoid. Eating the wrong foods, according to D’Adamo (a naturopathic doctor), would have the same affect on the red blood cells as administering the wrong blood to someone during a transfusion.

The rationale behind this plan is the biggest stretch of all and reaches comic proportions. His theory tries to tie in the evolution of man with changing blood types and diets. Any long-term success with this plan is an accident based on switching food intake to something more agreeable to your digestive physiology or your frame of mind when you entered the program (in other words, how important was it for you to lose weight). Also, although one might enjoy not having to track calories or fat, I’d hate to be the one in charge of purchasing or preparing food in a household where the members had different blood types!

No credible scientist supports the theory described in this book. The most often cited fallacies in this book are the relationship between blood type and disease and the assumptions made about the diet of early man. Early man ate what was available as human migration took place. And of course there is no record of success or clinical trials related to eating according to blood type.