Most children rarely get the chance to change an adult's mind using their own logic. However, developing logical thoughts is important to their decision-making and communication abilities. For example, dinner is taking longer than expected to prepare. A half-hour before it, your child asks for a snack. Usually, he hears, "Not so close to dinner." However, appetizers or sampling the dinner fare is not uncommon as an adult's hunger builds. Similarly, your child is hungry. You do have a legitimate concern that sweet snacks will ruin his appetite. Try stating it in a way that will elicit a logical response: "My only worry is that fruit snacks will keep you from eating your dinner." Listen to your child's response. Then, come to a compromise that allows a small nutritional snack, and keeps you both in good spirits when dinner is served.