If you've decided that you're going to have one slice of pie or a cookie, have one slice of pie or a cookie. We know—easier said than done! If you struggle with knowing when it's time to stop, make it harder to keep on munching.
Buy a single pastry from the best bakery in town instead of an entire box from the grocery store. If you make something yourself, bring the extras to a friend or neighbor. When you order an indulgent meal, pass on bringing home that doggie bag, or give it to someone else. If it's not around, you can't keep eating it.