For all of the happy wide-eyed optimists walking the streets, we have news for you: turn that smile upside down if you wish to have a longer life. According to a new study in Psychology and Aging, optimists have a reason to be pessimistic when it comes to life expectancy. In the study, people over the age of 65 who overestimated how satisfied they'd be with their life in 5 years had a greater chance of developing a disability or dying during that time.

Why the gloom news? Negative outlooks tend to be realistic, making someone more likely to be more careful and pay attention to their health. But frown not optimists. Researchers concluded that while life expectancy lags for you, positive thinking helps with general health challenges in life. When asked to write down their goals and think positively, individuals with heart disease, high blood pressure and asthma went to the gym more often and stuck to taking their medication.

While this might be the case, we're still sticking to our philosophy of disliking people.