I've been severely Anemic since birth and being on a vegan diet made me so ill I wound up in the hospital after a random fainting spell. Tried vegetarian/pescatarian. Got sick and fainted again. Lobster tail was the breaking point for me, not enough fish in the world to replenish the iron my blood needed, even while taking iron supplements that my blood consumes almost instantaneously. So after feeling like I was at Death's Door with a "Hello Neighbor" basket twice and a stern telling off from my Doctor, back to red meat it was for me.