Here is a really interesting interactive site that shows how people around the world are increasingly eating the same foods.
Hence, the homogenization of the world’s food supply allows insect pests of crops to achieve far broader distributions than previously possible.
http://www.nationalgeographic.com/foodfeatures/diet-similarity/
Food is becoming increasingly less tied to endemic plants and animals. Here is another interesting article from National Geographic:
http://www.nationalgeographic.com/foodfeatures/evolution-of-diet/