Blood Type diet

Blood Type diet

Blood Type diet

What is it?

The blood type diet originated with a theory proposed by Naturopath Peter Adamo that different foods react differently according to the blood constitution of the person. Part of this reactive process is blamed on Lectins, a class of toxin protein that is found within different food sources that interact with the digestive tract to inhibit digestion which ultimately leads to deficiency syndromes, reactive inflammation and eventually illness. Specific diets are prescribed for different blood groups, as follows:


  • Type O (the hunter): High protein (meat and seafood), low carb diets. Avoid dairy and vegetables. Avoid brassica family vegetables especially (cabbage, Brussels sprouts, cauliflower etc.). No coffee


  • Type A (the agrarian or cultivator): Largely vegetarian (vegetables, fruits, nuts & seeds), Carbs are OK but minimise dairy and fats. Coffee is OK


  • Type B (the nomad): Mixed and omnivorous- include meats, seafood, dairy, vegetables, wild game. Specific recommendations for weight loss include green vegetables, eggs and organ meats. These are the only group that supposedly thrive on dairy


  • Type AB (the enigma): Mixed and omnivorous- including a balance between meats, vegetables and dairy. Specific recommendations for weight loss include seafood, tofu and fruits such as pineapple. These are supposed to be the most recent to have developed and generally fall between the needs of group A and B.


  • No calorie counting, easy to follow
  • Not as restrictive as some diets
  • General recommendations to avoid gluten, and get plenty of exercise


  • There is no credible evidence to support the theory
  • Based on a whole lot of false assumptions:
    •  Hunter gatherers have not been shown to be predominantly type O
    • Type O is not the oldest group chronologically
    • Type B (those who supposedly thrive on dairy) is most common in Asia, where the incidence of lactose intolerance is highest
  • Not well balanced and portions sizes are not restricted

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