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Could keep you alive long enough but eventually you'd want some other nutrients.

Maybe there's a joke here that I'm not aware of, but my question was mostly why they think dairy is necessary. I do believe that potatoes isn't enough, but you don't need dairy products.

In the movie "The Martian" Matt Damon grew potatoes on Mars. Lived off of them and ketchup for a long time, and the ketchup ran out.

lol I wondered how long it would be before someone got it

> you don't need dairy products.

You generally need animal products for B12, but you can use supplements, I think. B12 deficiency can take a year or more to manifest severe symptoms.

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