I usually start craving something sweet, hmm, IMMEDIATELY after finishing my lunch.
I’ve found that the sweetness/tartness/crunchiness of grapes satisfies that craving in place of a cookie (or five) or some sugary cereal.
Luckily, my co. provides free grapes (and other fruit), so I can almost always choose the healthier way to satisfy my afternoon craving. I also snagged a tangerine-thing for the inevitable late-afternoon craving.
Satisfying a craving with something healthy works much better for me than just trying to ignore it completely!