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I'd still like there to be some kind of large-scale experiment to prove or disprove that humans can live healthy lives without meat, as long as they know every single source from which to extract the vitamins. (Seaweed has a lot of Vitamin B12, so I've read) As long as they aren't pills.
Just looking at the accounts of vegetarians isn't enough. They may have health problems they aren't talking about or something. A fully conclusive, massive scientific study whose results cannot be disputed must be done.
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