So I was reading this old blog post that I wrote after being post-call on my internal medicine rotation during my M3 year in med school and I mention this study where they concluded that forcing yourself to smile can actually make you happy.

I’m not entirely sure which study I was referring to at the time, but I did find this fMRI study:

Chang et al. “When you smile, you become happy: evidence from resting state task-based fMRI.” Biol Psychol. 2014 Dec; 103:100-6. doi: 10.1016/j.biopsycho.2014.08.003. Epub 2014 Aug 17.