That's not the problem. The resources (land, energy, man power, products, water, pollution, money, etc) required by calorie are way higher for meat. Hence we m

That's not the problem. The resources (land, energy, man power, products, water, pollution, money, etc) required by calorie are way higher for meat. Hence we must produce crappy food to get that quantity for everybody. And of course as a consequence, we have a lot less resources for growing things for human. Also, because animals are higher in the food chain, they concentrate all the active products we give to them directly (hormones, antibiotics...) or indirectly (pesticides, herbicides...).