'good diet' in medieval lmfao
Let me remind you that in medieval there were no spices, no salt, not anything. It was a good meal if you didn't get poisoning and died.
You usually ate some potatoes every day, or whatever your small farm could produce back then without fertilizers with terrible farming tech and practices. A peasant's food in the medieval was basically the same soup continuously made in one think on one fire stove, since boiling killed off the pathogens. If you'd have to eat medieval food to the rest of your life and live the life of a gigachad till the end, you'd just stick to modern food after one meal.