Well, I would not call "dieting" or "lifestyle changes" necessarily hobbies, but outside of these issues we all share, what else are you interested in?
I like to do some genealogical digging.
I have become more interested in history since my son has been getting older.
As a family, we have enjoyed going out and exploring our home state. You never know when you may have to relocate and wonder "I wish I had done that while I lived there".
I also like to scrapbook. I am a bit behind but I still have my things organized and ready to pick up where I left off.