Provide the theme summaries for the following conversation: 

#Person1#: Sally, I'm tired of this Western food. I really miss my mother's Sichuan cooking.
#Person2#: I'm sure you do miss that type of cooking. But can't you try to get used to Western food?
#Person1#: I have tried. But Americans like butter, bread, sugar, and cream too much.
#Person2#: I suppose you're right, Lee. Maybe that's why so many Westerners are overweight.
#Person1#: It's interesting that Americans work very hard at their jobs, do not take naps during the day, and yet they can be so heavy.
#Person2#: You see, because we are often busy working, we eat too much fast food, and that food is very fattening.

Summary: 
Lee and Sally think Western food is fattening and that's why Americans get fat, though working hard.