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What Is Happiness and Why Is It Important?

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in his 2002 best-selling book, Authentic Happiness. When we’re content, our bodies secrete chemicals including oxytocin, dopamine and serotonin, which help modulate our immune systems, thereby enhancing our health, says Deepak Chopra, M.D., co-founder and chairman of the Chopra Center for Wellbeing. Oh, and they have more sex, too.

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