Exercising and eating right gives you a lot of short-term benefits, such as weight control and increased energy. But a healthy lifestyle has a long-term benefit as well -- a longer life. And now we know that optimism is important to your lifespan as well.

Eight years into one recent study, female participants with a positive outlook were 14 percent more likely to be alive than their more-negative counterparts (participants were age 50 or older at the start of the study). The good news is that the same fitness and nutrition habits that can benefit your health can also benefit your outlook.

• Exercise. Not only does exercise relieve the stress that can contribute to a bad mood, exercise can also stimulate the release of brain chemicals that can leave you feeling more content and relaxed.
• Nutrition. Mood and food go hand-in-hand. When you choose nutritious, energy-promoting foods you'll feel more alert and ready to tackle your day.

In addition to a healthy lifestyle, take active steps to maintain a positive outlook. Try to balance your work, home and family responsibilities -- and be sure to leave time for having fun! Engage in regular stress-reducing activities; choose something that works for you, such as reading a book or getting a pedicure. Stop yourself from negative self-thoughts and do your best to be kind and non-judgmental of others.