What's something harmless that gets way more hate than it deserves?

Not really. The few vitamins that beef is lacking compared to RDVs are ones that compete with glucose for absorption. Vitamin C is a common one pointed to with this question. The reason we are recommended so much vitamin c is because most of it doesn't actually get absorbed, it passes right through due to competing with glucose. By removing the competition, the small amount of vitamin c in beef can be much more efficiently/completely absorbed and the individual won't become deficient.

For a long term example, people like to point to first nations/inuit tribes in northern Canada where edible vegetation is essentially nonexistent. Some tribes have survived and thrived for thousands of years on nothing but animals like seal, rabbit, and fish.

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