Would a peasant from medival times be able to survive if they had a medical condition that required them to eat more than 20k calories a day?

I just learned about a woman that has a medical condition that makes it more difficult for her body to absorb nutrients from food. This means she has a huge appetite and often eats more than 20k calories a day.

Would a peasant be able to survive this type of condition back then or would have they just died. Is there any writen record of this happening before?