On: UK teenager loses sight from poor diet

Potatoes are vegetables.

This story from 2010 shows that it is possible to live on nothing but potatoes[1].

[1] https://www.bbc.co.uk/news/magazine-11864290

Good point. I can only say that where I come from they are seen as something distinct, perhaps a category of food entirely their own.

There are also places in America, particularly the south, where macaroni cheese turns up on the vegetables list. I think that everyone kind of agrees that mac-n-cheese is a side, but not a vegetable.

And as far as I know contain a pretty decent amount of vitamin C at the very least.

They also contain a huge amount of potassium. Even more so than bananas.

Until you cook them? Vitamin C is not very heat resistant.

That's what I thought too until I actually looked into the matter, don't have source at hand but apparently 1 hour of cooking causes about a 30% drop in Vitamin C. Not that bad.

Do you know if leaving the skin on helps?

I was researching usage of pure vitamin C powder in cooked foods and tea. Don't think the skin matters much if the powder can survive.