why do people get stuck to a particular food?

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the normal food that the people eat in kerala is rice.as i studied in qatar,i always eat american food,fried items..etc and at times eat rice. so when some of my relatives came to qatar i took them to KFC... man..they didnt eat much,some of them didnt even have it..some of my friends just had fries...so we had to go to an indian restaurant...and ate from there...i dont get it ..why dont these people like american type of food...why r they stuck to their own food.what type of food do u normally eat...r u stuck with the same type of food always or do u eat differet types?...tell me your views...