The act of smiling is enough to make your life legitimately better, whether or not you are even happy. Alena Hall writes about the various ways this bizarre phenomenon occurs.
Make Like a Candid Camera
It begins by improving your mood. Your face and emotions are closely tied, so smiling can force your brain to think everything is great, which extends to relieving stress too—maybe down to the cellular level. Even a fake smile can make you feel better. In the long run, smiling trains your brain to think more optimistically in general. This is useful, because optimism makes an employee both more productive and more creative. Smiling affects how you are perceived by others too. They make you seem more approachable and trustworthy, and they cause other people to smile back. You can read the full article here: http://www.huffingtonpost.com/2015/02/08/smiling-benefits_n_6598840.html