The most important part in staying healthy is to be mentally healthy. This can be achieve in many ways such as keeping your mind limber and active. Read more books and take time to think about things. Challenge your mind by doing puzzles and strategy games. Most importantly, do good to other people. By doing good, you will also feel good and by improving the lives of others you will also improve your own mental state because you will know that you have done good to someone else. Keep a positive thinking will also keep your mind healthy.
Last but not least, you also need to be emotionally healthy. You need to start understanding your emotions and facing problems with a positive attitude. To be emotionally healthy also means to deal with your stress. Have a healthy relationship with other people such as your friends and your families. Most importantly, pursue your passion in anything. Even as a hobby, it can change a big portion of your life to be happier and healthier.