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never trust a dentist, all they want is your money. he is mistaken about history i'm afraid there have been many cultures on plant based an grain diet, that was the whole point of agriculture so ppl didnt have to do hunter gathering.....
read this with open mind and it will blow your mind.....
https://steemit.com/spirituality/@celestialcow/cow-s-are-not-commodities-the-ancient-history-of-heavenly-divine-cow

i also want to add that this would never be enough to convince any vegan, to me this looks like one guys travel blog from the 30s no way does it relate to modern day where people arent healthy and happy anymore because we live in a globalized world where all the food has been processed and tampered with.