149. The problem of sleep that teenagers often meet is that they often get less sleep than they need due to homework, social obligations, and early morning activities. 150. Teenagers should have a well-balanced diet that includes plenty of water, protein, whole grains, fruits, and vegetables. They should also not skip breakfast. 151. Doing physical activity gives us a good feeling because it releases endorphins, which are chemicals produced by the body that create a sense of happiness and well-being. 152. Other benefits of physical activity include building a strong body and mind, managing moods effectively, and improving overall well-being.