Forget eating three big meals a day. Eat around the clock. That doesn't mean bingeing on junk food whenever you see fit. Instead they encourage eating small, balanced meals.
The body usually needs three to four hours to digest an average size meal. To prevent the body from going into starvation mode, you should refuel it on cue. This also prevents your blood sugar from dropping in between meals. Keep healthy snacks on hand, and enjoy them between breakfast and lunch, and lunch and dinner.