Many people have a preference on the types of food that they eat. Once they have a set list of "safe" foods it is typically hard to get them to try new foods. The types of food that we eat in America is extremely different from the food eaten in other countries. For example, we would not really think to eat bugs, eyeballs, brains, etc. If people were willing try new foods they might end up actually loving it. Even with "normal" american food, there are some people who just cannot stand a certain type of food. Usually, this happens after trying it once and automatically not liking it. If people were willing to give certain foods a second, third, or fourth chance they would increase the liking of the food item.
Here is a video of American kids trying dinners from other countries: