If your blood type requires you to eat meat, you are likely to degenerate on a vegan diet quite fast, whilst on a vegetarian one there could be many years passing by until you see the symptoms.
For example, I have type O blood which requires meat-eating. Type A blood can last on vegan diets the longest. Type B can survive without meat quite long too.
Also, people from certain parts of the world with meat-based diets will degenerate faster than those who are from places like India, where people eat . . .
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