I exercise as much as my knees can take.
ride my bike 3-4 times a week, jog 1-2 times a week, try to get in yoga at least once a week.
I used to ride 200+ miles a week and do yoga 3 times a week but my knees just can't handle that kind of activity level anymore. When you feel pain, less is more.
Sometimes I just go for a nice brisk walk. It's four tenths of a mile around my neighborhood park so I'll go walk 10 laps when the mood strikes me. I'm 6'7" and stride it out as far as I can on my walks without lifting my knees.
I eat pretty healthy, but my downfall is my sweet tooth and my penchant for midnight snacks. Usually I do kashi with soymilk and fruit for breakfast, sandwiches for lunch and whatever my GF cooks for dinner. But don't get me near a cake or some M&Ms otherwise it's all over.
Oh and I drink a lot of coffee, which is the only reason I ever go to McDonalds.
I have a hypercoagulability disorder that put me in the hospital in 2008 with clots in my lungs. Now a coumadin patient for life. Also take Lipitor. OTC vitamins, coQ10, fish oil and glucosamine.
whew guess that's it.
I'm about the same weight I was my senior year in high school, about 260. Again I'm 6'7", lest you pass judgment