a nasty remark from a coworker or a traffic jam can cause your day to implode, you need to learn to shrug it off. According to research published in the journal Psychology Today, those who crumble at the first sign of stress have elevated cortisol levels (stress hormone) that lowers immunity and bone density, causes increased blood pressure, cholesterol, and weight gain. On the flip side, laughing off stress leads to a lower risk of depression and stronger overall mental health. So turn that frown upside down by turning a bad day into a good one. Visit a friend, play with your pet, listen to your favorite tunes, or go see a funny movie.