That is, if you are still in the normal growth and development period, you don't have to worry, but you usually need to exercise more, and then eat more vegetables and fruits. Supplementing nutrition is nutrition. You should eat enough, be reasonable, mix meat and vegetables, and then avoid the sun and glory. If you have passed the normal growth and development period, you can also, uh, eat calcium tablets, and then get more sunshine and exercise. So get more sunshine and eat some small change! .