Before I completely lost every essence of health that I had in my body, I probably would have said: nothing. Nothing, because I was convinced my body and soul were incorrigibly flawed and compromised.
But now, since losing my health and fading in and out of near-death states, I would say that my perspective has changed significantly and I would choose life, no matter the difficulties, as long as I had my physical health intact and close to fully functional.