I totally agree with you that ingesting drugs as few as possible and eating vegan foods is a good way to being less sick.
Even when I have a cold, I rarely take anything, I just wait until it's gone.
I have become vegan last October, this being the result of a long journey.
That's definitely my opinion. The energy levels that veganism can bring is unbelievable. Hard not to believe it is the natural diet when you have felt the difference that adhering to it can bring your mind and body.
As for drugs, prescription drugs at least, I'd rather suffer than take them. They physically alter your body in a way that I'm not convinced you can return from. Doctors are so quick to proscribe drugs for any ailment, when not so long ago, the Hippocratic oath used to include a part about NEVER giving harmful drugs to patients, and always offering dietary advice as means of improving their health. Now it's just about profit, and nothing to do with health. We have fallen so fucking far.