It's a good thing to make another person feel good. But being kind – doing something to help someone else – can help you, too. Research links kindness to a wealth of physical and emotional benefits. Studies show that when people are kind, they have lower levels of stress hormones and their fight-or-flight response calms down. They're less depressed, less lonely and happier. They have better cardiovascular health and live longer. They may be physically stronger. They're more popular. And a soon-to-be published study found that they may even be considered better looking.
— The Wall Street Journal