A person’s blood type is determined by the presence or absence of markers on the red blood cell. These markers are called antigens and are controlled by genes. There are 4 blood types: A, B, AB and O. The ‘eating for your blood type’ diet is based on the belief that our blood type shows the dietary habits of our ancestors, and that by following a certain diet for our blood type, we can reduce our risk of chronic disease.
According to this theory, people with the blood type O are encouraged to follow a higher protein diet with less dairy and grain products; type A should follow a vegetarian diet; type B should focus on eating green vegetables, eggs, low fat dairy products and avoid chicken and pork; and type AB should include tofu, seafood, dairy and green vegetables.
There is currently no scientific evidence that supports the Blood Type diet. Research has shown that following certain blood type diets may decrease a person’s risk of chronic disease; however, this decrease was not related to a person’s blood type but instead the types of foods they ate. Instead, we encourage people to enjoy a healthy well-balanced diet with lots of colourful vegetables and fruit, whole grains, lean meat and alternatives and lower fat milk and alternatives.
For credible sources of nutrition information, speak with a Registered Dietitian by calling EatRight Ontario toll-free at 1-800-660-5853. Visit the Health Unit’s website at healthunit.org, connect with us on Facebook and Twitter or call the Health Action Line at 1-800-660-5853.