I did when I was younger. I managed to take care of myself until my early 40s though and none of my fears panned out except for weight gain and physical disability. When I used to walk for miles I'd wonder if I ever might not be able to anymore and it would make me walk longer to appreciate it. Now, not because of that, I can't walk and im glad I appreciated it while I could. I'm glad I was able to work, have relationships and friendships while I could.