Nuts

I know my father is wanting to know what nuts he should be eating. He has type O blood.

Beneficial:

Flax seeds, macadamia nuts, pumpkin seeds, walnuts. (yep that is it)

Don't worry though there are neutral ones (not super beneficial but not bad):

Almonds, almond butter, chestnuts, filberts, hickory, pecan, pine, sesame seeds, sunflower butter, sunflower seeds, tahini (sesame butter).

:)