Knowledge: Diabetics cannot eat too late at night and the main foods to eat are vegetables and fish. On the other hand, the foods vegetarians should avoid are meat and dairy.

Conversation:
There are a lot of people who practice vegetarianism, but I don't think I ever could. I love meat too much.
Interesting to hear that. You have to consider that vegetarianism may have various reasons to be adopted.
Yeah I know. What are the main foods vegetarians cannot eat?

Response: Yeah, the main foods to avoid are meat and dairy.