I think most of us would take it for granted that we’re inclined to smile more when we’re happy, and to frown more when we’re not.
What’s really intriguing, though, is the experts’ view that it can also work the other way round.
In other words, smiling more could actually help you feel happier in the first place.
Whilst it’s certainly not easy to do, it seems that ‘making yourself’ smile when your spirits are low can give you a welcome boost, just when you need it most.
Of course, if you’re feeling gloomy, you’re unlikely to be striding around town with an inane grin plastered across your face.
Even were you to do so, people are actually pretty good at detecting a fake smile from the real McCoy.
So the trick is perhaps to pick opportunities when your smile is likely to be regarded by the recipient as unexpectedly welcome, rather than eerily misplaced.
Try a (proper) smile to a shop assistant, or to someone who stands back to let you go first.
Try it with a co-worker, fellow student or friend.
Even smiling to yourself can help.
So what are you waiting for?