I agree. I want to add the rumor that you can live on potatoes alone. At least one guy reported he did it for six weeks and the medical checks did not find any malnutrition. Don’t know how scientific that anecdote is, though.
https://www.dochara.com/the-irish/food-history/food-in-irela...
"The burgeoning population lived on a diet comprised mainly of potatoes and milk, which if eaten in sufficient quantity is a surprisingly nutritious, if monotonous, diet. It is also relatively tasty and easy to prepare."