With that kind of logic, most discussions would be meaningless. Basically we are all dying from a disease called "life". The point is how you want to die: either miserably from chronic illnesses brought by long years of bad habits or gracefully from old age. However, there are no guarantees, but if you don't buy a ticket, you have zero chances of winning. Anyway, eating "healthy" does not beat exercise.
Then it's seems that it's working out for you and maybe that would be a "middle road" for us, desk-bound people. However we still cannot fully counteract the negative effects of sitting, to quote the article which I linked in my previous post:
"Adding to the mounting evidence, Hamilton recently discovered that a key gene (called lipid phosphate phosphatase-1 or LPP1) that helps prevent blood clotting and inflammation to keep your cardiovascular system healthy is significantly suppressed when you sit for a few hours. "The shocker was that LPP1 was not impacted by exercise if the muscles were inactive most of the day," Hamilton says. "Pretty scary to say that LPP1 is sensitive to sitting but resistant to exercise."
One case = anecdote. There is actually some evidence that you can't counteract the effects of sitting with exercise, unless you exercise more than you sit. And what exactly does "I'm healthy" mean? Is that what the doctor says after doing some test or is it just how you feel? What would be the status of your health (as measured by tests from a doctor) if you had an active job and some moderate exercise for the same period of 13 years?