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The Blood Type Diet by Kathleen Simon

The Blood Type Diet

Kathleen Simon

Considering a new diet? Perhaps you’ve done your homework. You’ve read countless internet articles and binged on enough diet related YouTube videos you feel like a bonafide authority on ‘going raw vegan’ or adopting the paleo diet. Truth be told, hundreds of dietary theories abound. Apparently, there’s no one-size-fits-all diet, but there is a growing body of knowledge around personal nutrition.

But why? Remember that time you and your best friend adopted the paleo diet and she shed weight like a ninja and buzzed on natural energy while you gained ten pounds and fell asleep on your desk after lunch? Dr. Peter J. D’Adamo, N.D., speculated this may be due to genetic differences, namely the four blood types: O, A, B, and AB.

Time and again, the research shows that blood type in relation to diet is “the key that unlocks the door to the mysteries of health, disease, longevity, physical vitality, and emotional strength”(1).

Since then, Dr. D’Adamo has treated thousands of patients and has come to one conclusion. Time and again, the research shows that blood type in relation to diet is “the key that unlocks the door to the mysteries of health, disease, longevity, physical vitality, and emotional strength”(1). And that is one hefty claim! Critics argue that the absence of clinical trials makes his claim just that–a claim. And it is unfortunate, though not surprising, that no one has funded clinical trials for these studies because what Dr. D’Adamo is saying would put the power back into the hands of the public. Many would no longer rely upon allopathic medicine or Big Pharma for their wellness. Food would reclaim its rightful inheritance, and Hippocrates could stop rolling in his grave.

Largely, Dr. D’Adamo claims that our bodies favor foods consistent with the diets of our ancestors, but the nuts and bolts of this mechanism revolve around “[l]ectins, abundant and diverse proteins found in foods, [which] have agglutinating properties that affect your blood and the lining of your digestive tract”(1). Basically, each blood type is susceptible to its own set of ills, and you should test out a plan specific to your type to see what thriving is really like.

Eating a food with protein lectins compatible to your blood type is like putting a goldfish in a freshwater pond. In the pond, the fish thrives and can live well over ten years. Put that same fish in a bowl filled with tap water on the dresser,and you’d be lucky to see him living in a few months. Though the water may appear just as clean, it’s a ticking time bomb.

So, what’s your tap water? Your freshwater pond?

Blood Type O. If you’re a Type O, you’re related to the Hunter/Gatherers of society. Dr. D’Adamo says the right diet will enable you to possess “exceptional strength, a lean physique, and a productive mind…[while warding off] common Type O health issues including insulin resistance, sluggish thyroid, and inflammatory conditions”(2). Furthermore, he recommends routine, intense exercise to control stress and weight.

Blood Type A. Having emerged near the dawn of agriculture, Type A benefits from a vegetarian diet but also tolerates seafood quite well! As a Type A, you’re statistically known for carrying higher levels of cortisol and benefit from exercises like walking or yoga.  

Blood Type B. Dr. D’Adamo reports that Type B thrives when eating a diet of “organic meats, dairy, and vegetables.” However, when out of balance, the Type B is prone to  “insulin resistance, and hypothyroidism”(2). Regular exercise that allows the mind and body to work simultaneously is recommended.

Blood Type AB. If you are an AB blood type, you know you are among a rare group. Research shows that the prescribed diet of “lean protein, organic vegetables, and grains…[helps to combat] autoimmune diseases and age-related cognitive issues”(2). You thrive best when regularly adhering to moderate and calming exercises which allow you to destress.

Don’t know your blood type?

Ask your doctor. If you have ever had your blood drawn by your General Physician, chances are there is a record of your blood type. If not, try asking your doctor to run some blood work during your next wellness exam that includes a test for blood type.

Donate. You can usually find out your blood type for no cost at all by donating blood. Of course, you will have to meet some strict requirements beforehand, but if you typically exhibit low risk behaviors, don’t travel to too many crazy places and are in good health, this may be for you. Just be sure to find out if the place you plan to donate is willing to share that information with the donor.

Test at home. Blood type test kits may be purchased at your local pharmacy, but if you would prefer not leave the house, some kits as low as $6.00 have been seen on (along with Prime shipping)! Prick your finger and interpret your own results all from the comfort of your own home.

Still skeptical?

For more information regarding the scientific basis of this diet, recipes, and in-depth blood type profiles, please visit: