caudor said:Did medieval folk eat three square meals per day?
Three meals a day, but they didn't have the nutrition concept of "square meals" (which is a food-groups concept that came up in the 20th century). The commoners would generally break fast on whatever was left over from the night before (no refrigeration, so you eat it soon or it is wasted).
And how about milk? They did they have a way to keep it cold.
While ice for cooling foods has been around since Roman times, the typical man on the street didn't have a way to keep milk cold in the Middle Ages. That's kind of what cheese is for - preserving the nutritive value of milk. Plus, your common joe was rather likely to have a cow or goat that'd need to be milked every day - you don't need to keep it cold if you've got a continuous supply.