[The Hierophant]

As Gabrielles Blades has pointed out medieval dishes were very basic, at least for the majority of the population. Since most people were peasants with little land of their own they ate a bland diet consisting of food they could harvest from the land: wheat (bread), olives, cheese, butter, apples etc. Meat was only eaten very occasionally by the lower class, as lifestock were expensive to keep and seldom slaughtered. Of course, the ruling classes could afford to eat a much more varied diet, with meat factoring in quite significantly. Basically, for your average joe farmer you're looking at a staple of bread, with a few bland toppings to put on such as butter and cheese (nowhere near as flavoursome as today's cheeses though). Not incredibly nutritious. People were nowhere NEAR as healthy and well fed as they are in the modern industrialised world.
Additionally, most bread would have been gritty/sandy and not terribly appetising. Viking graves (dated to the period of about 800-1000 AD) have provided evidence of peasants with incredibly worn teeth. This is becasue the flour for bread was stone-ground, and alot of the stone that was used to grind the flour ended up in the bread itself, yuck! Also, mummified Viking corpses preserved in peat bogs have shown a great deal of intestinal parasites present, so many people must have been in a constant state of digestive discomfort.

The medieval age was not an incredibly luxurious time to be alive, even if you were a noble.