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Dr D’Adamo is a Naturopathic doctor and the founder of the Blood Type Diet which is based on the theory that chemical reactions occur between the foods that you eat and the type of blood you have. The theory suggests that a complex reaction happens between lectins (types of proteins) in food and your blood type antigen. These reactions can cause a myriad of symptoms and chronic health issues and are best avoided.

According to Dr D’Adamo your blood type is a genetic trait that can provide insight into which foods are better for you to eat and which foods are harmful. He separates foods into three categories for each blood type, “highly beneficial”, “neutral” and “harmful”.

The four blood types are O, A, B, and AB and below is brief description about which food are beneficial and harmful for each type:

O blood type is considered the oldest blood type and are the “hunter gatherers”. They do well on protein foods like meat, fish and poultry, as well as vegetables. They should avoid grains, beans and dairy which tend to increase their incidence of digestive issues.

Blood type As have sensitive digestive systems and do well as semi-vegetarians and can digest grains and plants better than other blood types. They tend to have lower stomach acid which means they don’t do well on meat. A should focus on eating fruit, vegetables, beans, legumes and whole grains that are fresh and organic.

Blood type B are known as nomads and do well on red meat, eggs, dairy and fish. They should avoid chicken, corn, tomatoes and lentils and focus on eating more green vegetables. B generally has a strong immune system and their digestive system is robust.

Blood type AB tends to be the newest and rarest blood type in evolutionary terms. They are a combination of the blood types A and B and thrive on dairy, eggs, and seafood and green vegetables. They do tend to have low stomach acid so should avoid red meat, alcohol and coffee.

While there is no scientific proof that the blood type diet works, there is a lot of anecdotal evidence and people often report losing weight, gaining energy and reducing their allergies and digestive symptoms. There isn’t much to lose, so give it a try and see for yourself!