I used to get sick quite often. I would come down with a bad cold maybe 5 or 6 times a year. It's still not exactly clear to me why I got sick, but I do know when it stopped. A few years ago I started dumpster diving food quite regularly and in great quantities. I would give away and eventually toss out much more than I could possibly eat. For awhile it was my main food source. It became a challenge seeing how much I could get, eating leftovers from a few tables over at restaurants, peeking in my neighbors' garbage cans for food that had expired.
The most amazing thing about this is that I couldn't have gotten sick more than twice in the few years this was going on. I lived in a house with mice (I even named them) and insects, and often ate spoiled food and accidentally mold sometimes. I attribute my well being to this. I have absolutely no scientific knowledge to back this up, it just always seemed logical that that was the reason. I'm glad to see that others have had similar experiences.
I plan on returning to my previous habits in the very near future,