Even though you're doing a terrific job in preplanning your grocery trips, there are going to be times when you have a grocery emergency and have to run to the corner market for one or two items. It could be because you have an unexpected guest arriving or because your teenager decided to eat all of the eggs for lunch that you needed for the evening meal. Whatever the reason, don't let that little side trip turn into a shopping extravaganza.
When you walk into the market, walk right past the shopping carts. If you have to carry your groceries in your arms, you are not going to be as tempted to pick up that lovely $10 bouquet of gladiolas (my personal temptation) or that $5 bucket of ice cream that your hips don't need anyway.
Leave the cart at the door and only buy what you really need.