Yeah, potatoes are like the only food I know of that a human can just about live off of successfully.

If we were serious about going to Mars, there would be more research into growing potatoes on Mars:

https://news.ycombinator.com/item?id=13823275

Just sayin'.

>By the 1800s, the potato had become the staple crop in the poorest regions. More than three million Irish peasants subsisted solely on the vegetable which is rich in protein, carbohydrates, minerals, and vitamins such as riboflavin, niacin and Vitamin C. It is possible to stay healthy on a diet of potatoes alone. The Irish often drank a little buttermilk with their meal and sometimes used salt, cabbage, and fish as seasoning. Irish peasants were actually healthier than peasants in England or Europe where bread, far less nutritious, was the staple food.

<https://www.historyplace.com/worldhistory/famine/introductio...>

and after ~1590 of course, when the potato was introduced to the British Isles