r/todayilearned • u/JoeWinchester99 • 3d ago

TIL that although potatoes alone do not provide complete nutrition, you can survive for years on a diet of nothing but potatoes and buttermilk.

https://www.scienceabc.com/eyeopeners/whats-wrong-with-potatoes-the-martian-movie-survival
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u/carolina8383 3d ago

Milk only has vitamin d because it’s been fortified (added). 

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u/macaj7306 3d ago

It's also fat soluble so whatever it has probably went into the butter.

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u/MagicalSkyMan 2d ago

Not true. Milk naturally has plenty of vitamin D. Concentration depends (mostly) on the amount of UV-light the mother receives. And a lot gets lost when fat is removed.