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A middle class person today can if they choose have a much more varied diet than anyone could in medieval times. Even as recently as the 19th century it was an extraordinary luxury in northern Europe to have fresh fruit or vegetables in the winter, for example.

And of course medieval Europe did not have any of the species they later got from the Americas: no potatoes, peppers, corn, tomatoes. There was no coffee or tea or chocolate either. And no ocean fish unless you lived close to the sea.

If you were a rich person in medieval times you could basically have a much roast beef as you wanted. (That was apparently Charlemagne's undoing.)