A healthy diet is one that is balanced and nutrient dense. So you're eating a balanced amount of carbs, veges, proteins and calcium (which is individual). And of those foods you're eating vitamin and mineral rich foods - whole wheats, fresh fruits and veges, fresh meats and enough calcium rich foods. Eat foods that are most closely to how they came out of the earth - fresh and just prepared. Not frozen, processed, fast food or factory made. So bad - bisquick pancakes, McDonalds hamburger, french fries, soda, chips, candy, frozen tv dinners. Good - cheerios with a banana, skim milk or soy milk, salad, yogurt, apple, almonds, carrots, grilled chicken with spinach. Don't forget to drink your water!