What can bagels teach us about ideas

Sure, it happened suddenly, but I had no choice—last year I removed bagels from my diet. Here’s how it happened: while reading one of those “Eat this not that” books, I came across this, to me, surprising fact:

“Hmmm,” I thought to myself, “not sure why, but bagels always seemed so innocent to me.”
No nutritional value whatsoever—I never would have suspected it had it not been for the above book.

My 2¢:
Do you carry around any ideas that may be dated, dubious, if not 100% imaginary?
In life and in business, ideas have a shelf-life. It’s easy to forget that.
From time to time, dig into you-name-it deeper and ask, “How much do I really know about ___________?”