Well if you look at it from the Bible God said plant/herbs are your meat it wasn't after the flood that God gave permission to eat clean/pure meat from certain animals. Which means eating animals that are given no Antibiotics /growth hormones and are feed grass all the way to butchering.
I never knew my blood type but after my wife read the blood type she kept requesting me to get it checked. I always worked out hard with weights and felt good after eating grass feed beef with vegies/beans,etc . I consume no wheat products that have been processed since that makes me feel low. I can tell the difference after not eating beef for awhile becaue I try to follow the bible to eat plants & herbs. But once eating meat or liver
Anyway I find out my blood type if O positive and according to his book from his research Os are geard more to Red Meat/no wheat while my wife is A geared more to all vegies eating. Also the same for exercise Os a lot of workouts vs A mostly less stressed worouts.
I think it all depends on what part of the world you come from. From Eskimos eating all meats to other parts of the world eating all plants to Tropical areas eating all coconuts and fish.