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Re. the vegan diet, how do the animals we eat end up giving us Vitamin B12, Omega 3, Iron etc.

Asked by flo (13313points) August 24th, 2016

Is it a fact that you can’t get everything from a vegan diet?The animals we eat, like cows, pigs, etc., eat plants and/or grains. How do they give us Vitamin B12, Iron etc.? If they can be healthy without eating meat, why can’t humans?

http://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/vegetarian-diet/art-20046446?pg=2

http://www.thesweetbeet.com/vegan-diet/

http://www.webmd.com/food-recipes/guide/vegetarian-and-vegan-diet#1

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