What about you? In pairs, ask and answer. 1 In what situations do people in your country
smile at people who they don't know?
2 How do you feel if someone gives you a
fake smile?
3 How do you cheer yourself up when you're in a
bad mood?
4 Think about something very sad. Then think
about the same thing and smile. Are your
feelings the same or different?​

Ever had someone tell you to cheer up and smile? It’s probably not the most welcomed advice, especially when you’re feeling sick, tired or just plain down in the dumps. But there’s actually good reason to turn that frown upside down, corny as it sounds. Science has shown that the mere act of smiling can lift your mood, lower stress, boost your immune system and possibly even prolong your life.

It’s a pretty backwards idea, isn’t it? Happiness is what makes us smile; how can the reverse also be true? The fact is, as Dr. Isha Gupta a neurologist from IGEA Brain and Spine explains, a smile spurs a chemical reaction in the brain, releasing certain hormones including dopamine and serotonin. “Dopamine increases our feelings of happiness. Serotonin release is associated with reduced stress. Low levels of serotonin are associated with depression and aggression,” says Dr. Gupta. “Low levels of dopamine are also associated with depression.”

Fake It Till You Make It

In other words, smiling can trick your brain into believing you’re happy which can then spur actual feelings of happiness. But it doesn’t end there. Dr. Murray Grossan, an ENT-otolaryngologist in Los Angeles points to the science of psychoneuroimmunology (the study of how the brain is connected to the immune system), asserting that it has been shown “over and over again” that depression weakens your immune system, while happiness on the other hand has been shown to boost our body’s resistance.

“What’s crazy is that just the physical act of smiling can make a difference in building your immunity,” says Dr. Grossan. “When you smile, the brain sees the muscle [activity] and assumes that humor is happening.”

In a sense, the brain is a sucker for a grin. It doesn’t bother to sort out whether you’re smiling because you’re genuinely joyous, or because you’re just pretending.

“Even forcing a fake smile can legitimately reduce stress and lower your heart rate,” adds Dr. Sivan Finkel, a cosmetic dentist at NYC’s The Dental Parlour. “A study performed by a group at the University of Cardiff in Wales found that people who could not frown due to botox injections were happier on average than those who could frown.”

And there are plenty more studies out there to make you smile (or at least, serve as reference for why you should). Researchers at the University of Kansas published findings that smiling helps reduce the body’s response to stress and lower heart rate in tense situations; another study linked smiling to lower blood pressure, while yet another suggests that smiling leads to longevity.

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Smiling Helps On A Day-To-Day Basis

Studies aside, there are plenty of living, breathing, smiling humans who can testify to the fact that looking the part of happy helps them get through the day.

“Smiling absolutely changes the way I think and feel,” says Jaime Pfeffer, a success coach and meditation instructor based in Florida. “My husband and I purposely spend 60 seconds every morning smiling to supercharge our mood. It's part of our morning routine. If something goes awry during the day, I usually use smiling to quickly shift my mood. It only take 10 to 15 seconds for it to make a difference for me now. It helps me to feel less stressed, transform my mood quickly and put things in a different perspective.”

Pfeffer adds that she recommends smiling to all her clients, particularly when they’re dealing with long days or tedious work. “One of my clients last week told me smiling for 30 seconds at a time a few times per day helps him stay upbeat when doing sales calls. He said the task can get old after a while, but the smiling helps him stay more energized and avoid burnout.”

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Travel writer Clemens Sehi uses a smile not just to feel better, but also as a way of setting an amicable tone with strangers abroad.

“When traveling there is one thing that one realizes quite fast: a smile can change everything. It can open doors and the hearts of other people whose culture you do not even know. A smile is the most international language that everyone knows.”

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A smile is also something that is easy to pass on. Much like yawning, smiling is contagious.

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