"Scientists have theorized that evolutionary outcomes of natural selection have given us our attraction to beauty. But when they investigated if beautiful people are happier than their counterparts, the surprising answer was no. As the current theory goes, we didn’t evolve for happiness; we evolved for survival and reproduction. Negative emotions like fear help us survive individually; positive emotions like joy help the community to survive.
We think we want to be happy all the time, but the fact is that an emotion, like happiness, is a primitive signaling system. They are how your brain tells you if the things you’re doing are enhancing or diminishing your chances of survival. Emotions are supposed to fluctuate. You’re not supposed to stay on “happy” during an earthquake. Happiness is a place to visit, not a place to live." via Medico Musings