Nutrition for teenage girls. Milk, cheese and yoghurt are the best sources of calcium and the need for these foods is higher than at any other will find facts on proper teen nutrition, effects of poor teen nutrition, ways to get teens Iron intake is especially important for teenage girls, as menstruation depletes iron. Additionally, dark green vegetables are good sources of iron the LA Times published a report about the DASH diet for teenage girls. It beat all others over a 10 ...