What these people do not understand is that, after millennia evolving morphologically, we have done it thanks to consume meat (both flesh and organs). Yes, good quality meat, full of saturated fats, blood. This is how we have developed our system. Today a portion of the population is being malnourished and malnourishing their children with the idea of not killing animals, so as not to cause them pain and thus ethically live well. The truth is that these people become addicted to sugar, either in the form of carbohydrates, and believe me, they always throw everything down, but all vegans end up fatal. Just watch them on YouTube, when they give up their unnatural diet.

There are 15 nutrients (Vitamins: A, B6 [pyridoxal, pyridoxamine], B12, D, F, K2; Aminoacids: Creatine, Carnitine, Carnosine, Taurine; Heme-iron, CoQ10, CLA) that are only obtained from animals and can not be found in plants. From animals we can not only obtain all the macronutrients, but also all the necessary minerals to have a healthy body, even so, there are people who believe that eating fruits, vegetables and carbohydrates is the healthiest way. This is how they lose their hair, this is how allergies on the skin, intestinal problems, constant gas, lack of libido and sterility come for both men and women. There is not such "I'm allergic to meat" but there are uncountable allergies to plants, seeds. Plants don't want to be eaten, that's why they contain antinutrients and toxins. It's their way to survive from predators.

People who eat plants get intoxicated, reducing the absorption of minerals, weak proteins and the few macronutrients that one can ingest in a meal. This is studied. Anyone interested in this topic can investigate it. I can recommend the excellent book Nutrition and Physical Degeneration from Weston Price as a starting point.

BTW: I am ex vegetarian/vegan. I didn't "did it wrong".