1. Save Energy. It's true, smiling uses fewer muscles than the number it takes to frown. You can use the energy you saved to focus on something more important.
2. Smiling is contagious. Most have heard it over and over again, but that doesn't make it a lie. People are more likely to smile if they see someone else smiling, says Mark Stibich, Ph.D., on About.com
3. Lift yourself up. Even forcing your lips to smile can cause you to be happier. Your brain detects the smile, and it enables you to think you feel better, whether it be true or not.
4. Make friends. Others are generally more attracted to a smiling person. They think that if you can manage to be pleasant, maybe you can help to make them feel happier as well.
5. Be healthier. Smiling aids your immune system to keep you healthy. It helps the immune system run more smoothly because, when you smile, you often become more relaxed. The relaxation then helps you to fight off disease, Stibich also reports.
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