The Adoption of Wheat and Grains Caused a Food Scarcity Problem

People of western european descent who adopted grains developed iron deficiency. Humans didn't know, of course, that would happen. It's one of the reasons why we have hemochromotosis. If you really want to make grains hail healthy, it'sgoing to be another 50 to a hundred thousand years of evolution and severa many more adaptations to make them truly tolerable by modern humans.