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So is the answer veganism? Well ignoring the B12 and any other deficiencies in there - it's not like farming is so eco-friendly either. More so? Maybe, but will farming organic plant matter be able to feed our human population that is exploding, with the climate change that is going on and considering all of the places in the world where having a cow can mean the difference between malnutrition and survival? I doubt it.
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Actually, in the US at least, it is very uncommon to have a B12 deficiency strictly related to diet. Most B12 deficiencies are in relation to having a lack of intrinsic factor - that is, the substance that allows you to absorb it from your gut. If you do happen to be missing the intrinsic factor, you'll have to get B12 through IM injections for the rest of your life, so veganism becomes a moot point for you anyways.
Most processed foods now days are required to be so fortified with all vitamins and minerals that even the strictest of vegans don't even have to take a basic multi-vitamin.
I hate to see concerns like these - which I consider basically frivolous and which seem to come from a large number of people who no greater education in and understanding of nutrition - discourage people from vegetarianism and/or veganism.
Also, farming plants is significantly more eco-friendly than farming animals. For one thing, it saves a tremendous amount of water, which can then be utilized for human consumption ... not to mention all the grain that is raised to feed animals that could be used for human consumption.
How do you not understand that farming plant life is not the same as farming non human animals from an environmental stand-point?
Certainly some climates and areas are not ideal for growing food suitable to sustain life; however, given that this is a mobile world, I have no doubt that with the money saved and the increase of available food, there would be some way of shipping food where it needs to go. (of course, political climates in war torn areas would have to be addressed, but this is a totally separate issue.)