The majority of people do not know their blood type, not to mention its importance when choosing food as medicine.
It is your sugar type. A sugar type you need to know to prevent inflammation and increase energy. They condition your gut.

Type A and Type O are equally as common.  Type AB is only 2-5% of the population.  Blood types are different types of sugars that interact differently with different lectins on proteins.  This can be beneficial with the food interactions or detrimental and cause inflammation.

Doctors in the U.S. do not routinely keep your blood type on file.

Doctors in Japan hire specific blood types for specific job descriptions.

The personality of a well balanced A blood type is extremely opposite from the personality of an O blood type.  Their stomach acids levels are extremely opposite as well, leading us to why A bloods benefit from coffee and O bloods suffer from acid reflux.