As we know, __1__ . Food gives us energy, so __2__ . Of course, __3_ . We should eat more fruit and vegetables and less meat. A cup of milk and an egg a day can help make us strong. __4__ But if we eat too little or too much, or if we choose the wrong food, we may become sick. __5__ .

从方框中所给的选项中选出能填入空白处的最佳选项，补全短文。