More than a century after their discovery, we still don’t really know what blood types are for. Do they really matter? Carl Zimmer investigates.He goes on quite a bit about how the "Blood-type Diet" has no merit.
But then he explains that blood types influence susceptibility to infection. He even mentions intestinal infection.
He's so close...
...Infection clearly affects metabolism...
Indirect correlation. It explains a lot. Try it sometime.
