Maybe you had a granny whose raspy voice you still hear rattling around your head every time you feel a cold coming on. "Feed a cold, starve a fever." Or, wait, is it the other way around?
Maybe every time you stick a hand in the fridge, foraging for something yummy, you hear that ringing won't-go-away rhyme, the one about the apple-a-day and the doctor.
And before you let the incessant rhyme out of its cage, you slam the door and run for the cookie jar.
So here's the burning question: What's with all those aphorisms anyway? Is there any truth to the bits of medical folk wisdom we all know by heart, if not by practice?