The theory behind this diet is that blood type is closely tied to our ability to digest certain types of foods, so that the proper diet will improve digestion, help maintain ideal body weight, increase energy levels, and prevent disease, including cancer and cardiovascular disease.
Type O was said to be the original “ancestral” blood type of the earliest humans who were hunter-gatherers, with diets that were high in animal protein. Group A was said to evolve when humans began to farm and had more vegetarian diets. Group B blood types were said to arise among nomadic tribes who consumed a lot of dairy products. And since Group AB blood was supposed to have evolved from the intermingling of people with types A and B blood, type AB recommendations were intermediate between those for people with types A and B blood.
Each of these theories has been challenged. For example, there is evidence that type A was actually the first blood group to evolve in humans, not type O. In addition, there is no proven connection between blood type and digestion. So, in addition to a lack of evidence that the diet works, serious questions remain about why it should work in the first place.
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Diet not working? Maybe its not your type
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I’m O- and the blood type diet works really well for me.
I think I it has more to do with our immune systems. For example, the B blood type could not possibly have arisen due to dairy consumption if the source of dairy was bovine.
Bovine milk contains both A1 and A2 proteins. Because the B blood type produces A antibodies, an immune system reaction would be the result of bovine dairy consumption.
Personally, I am a B- negative blood type. I’m not lactose intolerant, but drinking more then a half of cup of milk or indulging in too many dairy products makes me feel physically ill. It makes me feel like I have a case of the flu.
I’ve had a natural aversion to milk and milk products since I was a young child. I can handle A2 better then the A1 because type A1 has significantly more surface antigens then type A2.
Like the O blood type, I absolutely need a high protein diet due to a high percentage of muscle mass. I become very muscular for a woman. I, also, need a good variety of vegetables to supply complex carbohydrates and fruits to supply plenty of simple carbohydrates for quick glucose conversion when I need the energy. I crave bread products with yeast periodically because yeast stores glucose.