Re: Don't forget the chocolate!
Chocolate? In the form brought back from the Americas circa 1500? A cause for diabetes? Better brush up on your facts. Chocolate back then wasn't anything like a Cadbury milk chocolate bar. And I rather doubt old Chris brought back any chocolate. He only got as as far as the Caribbean and chocolate comes form the mainland.
But cane sugar, from India, predates chocolate in Europe. Personally I'd be blaming diabetes on sugar. I'm led to believe it was the crack cocaine of Baroque Europe.
And on the topic of new world foods: there's also tomatoes, chilis, and pumpkins, on top of maize (corn), potatoes, and chocolate already mentioned. Makes me wonder what the Indians (as in India Indians) would be eating today instead of curry. Or what the indigenous peoples of sub-Saharan Africa would be eating instead of corn and pumpkins.