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They do have to take supplements, of course. It's their prerogative.

It's much harder to have a balanced diet eating only plants. You can't easily compete against organisms that only eat plants, and have been collecting all the nutrients, for their entire existence, for you.

Humans are adapted to eat from both plants and animal sources. Take away one source, and you have to adapt.

The only supplement vegans and vegetarians need to take is B-12. The rest comes from having a varied and balanced plant based diet. Something interesting to note is that many people, regardless of diet, are at least somewhat deficient in B-12 and should supplement. And the meat that contains B-12 usually comes from supplementing the feed given to livestock with B-12.

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