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This is a common shibboleth among the self-help crowd. The implication is that smiling is more natural than frowning, i.e. you are really happy, you just don't know it.

The fact is, a typical sad person (anyone I've seen anyway) doesn't frown when he/she is sad or depressed. Remember, a technical 'frown' is an expression where the corners of the mouth are turned down, the symmetrical opposite of a smile. When a person is sad, unless he/she is talking or screaming or crying, his/her mouth is typically oriented neutrally, as a straight line. And this position requires the fewest muscles of all!

Anyway, it definitely takes more muscles to fake than it does not to.
From Despair, Inc.:
It takes 46 muscles to frown, and 17 to smile, but it doesn't take any to just sit there with a dumb look on your face.

or, for the more homicidal of us, from sources unknown:
It takes 46 muscles to frown, and 17 to smile, but it only takes 4 to pull the trigger on a well-oiled sniper rifle

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