A carrot is a vegan food item worth 50 nutrition points. Knights start the game with 10-20 uncursed carrots. You can eat a carrot to cure blindness (except from a cream pie); you can also use carrots as treats for training an herbivorous pet such as a horse. However, blinded herbivorous creatures do not regain sight upon eating a carrot.
"What is certain is that carrots and their eyesight enhancing properties were known to the Greeks and Romans, yet they declined to plant them on any notable scale, considering them to be an inferior vegetable.... Carotene is converted to Vitamin A by the body and A vitamins are great for your eyesight - the Greeks and Romans were right after all, they just didn't know why."
"Claim: Eating carrots results in improved vision. Status: False."