Discussion about anything. You can talk about politics, world events, news, life, business, and etc. Nothing is off the table.
I have been discovering being vegetarian is the best decision I have ever made. I use to like eating junk food and soda for the most of my life. Finally, I made a conscious decision to go vegan. I have been doing this for 3 months, I have noticed my mind is more clear, alert, empathetic, and responsive. I got into meditation, that really helped a lot. Never turn back to my old lifestyle.
You can try the raw food diet. Of course, it's not for everyone. Doing this and yoga is the perfect match for me. Give it a try. Just some thoughts.