BE happy I'm always very happy! Sometimes I'm happy about things that I had done. Sometimes I'm joyful about things done by others. Being happy is healthy. It is not only mentally healthy but physically healthy. So if you want to live healthily, smile and be happy! In the opposite side, being sad and mad is unhealthy. Sadness can cause depression. Angriness may make others hurt! Apart from mental and physical influence, both happiness, joy or sadness and angriness can affect others. So I strongly advise you to be happy.