The happier you are, the better, right? Not necessarily. Studies show that there is a darker side to feeling good and that the【C1】______of happiness can sometimes make you less happy. Too much cheerfulness can make you deceivable, less successful—and that's only the tip of the iceberg. Happiness does have【C2】______. It can protect us from stroke and from the common cold, makes us more【C3】______to pain and even【C4】______our lives. Yet, June Gruber, a psychologist warns that it's important to experience positive moods in moderation. She compares happiness to food:【C5】______necessary and beneficial, too much food can cause problems;【C6】______, happiness can lead to bad outcomes. "Research indicates that very high levels of positive feelings【C7】______risk-taking behaviors, excess alcohol and drug consumption, overeating, and may lead us to【C8】______threats," she says. How else can excessive joy, or having lots of positive emotions and a relative absence of【C9】______ones, hurt you? First, it may【C10】______your career prospects. Psychologist Edward Diener, known for his happiness research, and his colleagues analyzed a variety of studies, and discovered that those who early in their lives reported the highest life【C11】______years later reported lower income than those who felt slightly less【C12】______when young. What's more, they【C13】______school earlier. Included in the studies was one【C14】______a group of American college freshmen who in 1976 claimed to be very cheerful. Surveyed again when they were in their late 30s, they earned, on average, almost $3,500 a year less than their slightly less cheerful【C15】______. Why? Diener suggests that people who don't experience much sadness or anxiety are【C16】______dissatisfied with their jobs and therefore feel less pressure to get more education or change careers. Psychologists point out that emotions are【C17】______: They make us change behavior to help us【C18】______. Anger prepares us to fight; fear helps us flee. But what about sadness? Studies show that when we are sad, we think in a more systematic manner. Sad people are attentive【C19】______details and externally oriented, while happy people【C20】______make snap judgments that may reflect racial or sex stereotyping.