Don't buy it. Ever.

I'm a grabber, whatever is quick and easy is usually my first pick. So, I keep cut up produce available, raisins, grapes, whole grain saltines for the incidental salt rush, cottage cheese that I eat by the tablespoon right out of the carton, sometimes a whole grain baguette cut up in a suckerware tub. Being able to just snag the right stuff in passing really helps me stay on track.