Why should we be happy?

Seeking happiness seems to be the thing to do. These are the messages all around us: Go on this holiday to be happy. Eat this food to be happy. Get this job to be happy. Have the perfect family life to be happy. The research would say we’re wired to go towards pleasure and away from pain and therefore we should seek a life with maximum happiness. But could this be an over-worked concept that isn’t serving us?