Even if all “plant-based” foods were, in fact, natural, made from clean vegetables, fruit, and seeds, a purely vegan diet would be insufficient to keep most people healthy. Nutrients that are only found in animal foods include preformed vitamins A, B12, D3 and K2 (MK4 subtype), haem iron, taurine, carnosine, creatine, CLA, EPA, and DHA. Nutrients low in plants include zinc, iodine, methionine, leucine, choline, and glycine. Furthermore, plants often have different forms of the same nutrient that are less bioavailable and are metabolised differently