A common expression at least around here is that if you don't have your health you have nothing. Here are a few quotes on health, some humorous, some are common sense and wise, and with a healthy dose of truth. (source)
"Be careful about reading health books. You may die of a misprint."
"As I see it every day you do one of two things: build health or produce disease in yourself." - Adelle Davis
"The greatest wealth is health." - Virgil
"If I'd known I was going to live so long, I'd have taken better care of myself."
"Good friends are good for your health." - Irwin Sarason
"The more severe the pain or illness, the more severe will be the necessary changes. These may involve breaking bad habits, or acquiring some new and better ones." - Peter McWilliams
"There are some remedies worse than the disease." - Publilius Syrus
"Life expectancy would grow by leaps and bounds if green vegetables smelled as good as bacon." - Doug Larson
"Happiness lies, first of all, in health." - George William Curtis
"A good laugh and a long sleep are the best cures in the doctor's book." - Irish Proverb
"Know, then, whatever cheerful and serene supports the mind supports the body too." - John Armstrong