what topic in "life styles" that can be related to culture?

Hello Sir,
Please can you help me to decide which topic I’m going to present as an expose; I have a presentation in the module of “issues in culture” and which is about “life styles” and I wonder which topic I am going to talk about and that has to be related to culture; can I talk about diet, illness and food, or … but I did not know what is the relation between them and culture?
Would you please help me decide what I will do.

life style = subculture