the digestive track of cows and other grassfed animals has almost nothing in common with ours. thats why they can eat exclusively grass and we cant. plants are incomplete nutrition which is why veganism and vegetarianism are the nwo diet. here are just the vitamins you will never get from plants in the right forms or at all. not including minerals and macros. this is why plant based diets have to include buckets of supplements or suffer through illness Vitamin A – It is approximately 20 times more bioavailable in animal-based food than plant-based foods. In fact, plant foods don’t actually have vitamin A. They have carotenoids which have to be converted to Vitamin A. Vitamin B – Animal-based foods are the best source of B Vitamins. Especially B12. Vitamin C – Plant-based foods are a better source of vitamin C. Does it matter? (Hint: Yes and No.) Vitamin D – Plants don’t contain Vitamin D3 (the form our body needs). Sun and meat is our answer here. Plants have Vitamin D2, and our body can convert some D2 to D3 Fungi are also a source of vitamin D Vitamin E – Plant-based foods have higher concentrations of vitamin E. And for good reason. A plant-based diet requires additional protection from oxidation of PUFA which Vitamin E helps provide through its antioxidant properties. It’s still found in adequate supply in meat. Vitamin K – Both plant and animal foods have the K1 version; however, plants don’t have K2 which is vital for human life. K2 also has numerous forms. The essential kind we need is MK-4, which is only in animal food. We can convert some K1 to MK-4 but generally not enough to meet our needs.