ScienceDaily (2011-03-01) — A review of more than 160 studies of human and animal subjects has found “clear and compelling evidence” that — all else being equal — happy people tend to live longer and experience better health than their unhappy peers.

Another study has found that being positive, moderately happy and having reduced stress increases health and longevity. They tend to have healthier immune systems and recover faster. This isn’t true for just humans but animals as well.

Pessimism, depression, and anxiety are associated with lower immune system, more disease, and a shorter life span.

One of the study’s authors, Ed Diener said, “…that health and then longevity in turn are influenced by our mood states.”

Since what we think directly affects the way we feel and our mood, here’s just another reason to be optimistic and positive. And optimism is a skill that can be learned. Aren’t the benefits worth it?

To read the entire article, visit Happiness improves health and lengthens life, review finds.