One or two slices of small, thin-crust pizza loaded with various vegetables, fresh or dried herbs, lean protein toppings, and moderate amounts of low-fat cheese can be a kid-approved healthy lunch option for a teenage girl. Remember, the portion of food your teen eats may vary based on factors such as physical activity. However, what doesn’t change is the focus on making healthy dietary choices by picking the least processed, low-salt, low-fat, and low-sugar ingredients.