Dietitians say what your child eats really does matter. Especially since it can affect their energy and ability to concentrate. Their lunches don't have to be elaborate. Simple things like whole wheat crackers, deli meat, low-fat cheese, and yogurt are all good options. You could also give them chicken, hard-boiled eggs, hummus, beans, mixed nuts, carrots, apple slices, or a peeled clementine. If you have leftovers from dinner the night before, you could pack those using an insulated container. Meal prepping can be another big-time saver.