Is there evidence that type A was the first blood group to evolve in humans?

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From Harvard Health Publishing:

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.

https://www.health.harvard.edu/blog/diet-not-working-maybe-its-not-your-type-2017051211678
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  1. Mauricio November 18, 2021 Reply
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