Is it better to look at the glass as half empty or half full?

If you have a hard time finding the bright side to life, lighten up...

New research proves that optimists are not only happier, they are healthier and likely to live longer than the Doubting Thomases and Debbie Downers. 

The study looked specifically at the hearts of optimists and pessimists and found that the happy bunch had significantly lower instances of heart attack, stroke and other cardiovascular issues. Researcher Julia Boehm, at Harvard School of Public Health in Boston, said people with a more positive outlook on life also exercised more, ate healthier and slept better. Ultimately, they were physically healthier and less likely to have high cholesterol, high blood pressure or be obese.