Dopamine controls the brain's reward and pleasure center, and smiling helps release dopamine which leads to us turning to smiling rather than food to make us feel better!!!
It really is true! This is from http://www.psychologytoday.com/blog/your-brain-food/201112/addicted-smiling:
When we smile, fake or real, the contractions of the facial muscles slightly distorts the shape of the thin facial bones. This slight distortion in their shape leads to an increase in blood flow into the frontal lobes of the brain and increases in the release of dopamine (Iwase et al., 2002, Neuroimage17:758). As a result, walking around all day with a smile on your face will bias your mood to be happier. Not only will you be happier but your smile might spontaneously induce the release of dopamine in someone else's brain—now that truly demonstrates the power of a smile.
SMILE!!!! :)
Natural Ways to Increase Serotonin and Dopamine Levels Handout
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