A large body of recent work has suggested that people who are more grateful have higher levels of subjective well-being. Grateful people are happier, less depressed, less stressed, and more satisfied with their lives and social relationships. Specifically, in terms of depression, gratitude may serve as a buffer by enhancing the coding and retrievability of positive experiences.
Grateful people also have higher levels of control of their environments, personal growth, purpose in life, and self-acceptance. Grateful people have more positive ways of coping with the difficulties they experience in life, being more likely to seek support from other people, reinterpret and grow from experiences, and spend more time planning how to deal with the problem.
Grateful people also have less negative coping strategies, being less likely to try to avoid the problem, deny there is a problem, blame themselves, or cope through substance use. Grateful people sleep better and this seems to be because they think less negative and more positive thoughts just before going to sleep.
Gratitude has been said to have one of the strongest links with mental health of any character trait. Numerous studies suggest that grateful people are more likely to have higher levels of happiness and lower levels of stress and depression.
While many emotions and personality traits are important to well-being, there is evidence that gratitude may be uniquely important. First, a longitudinal study showed that people who were more grateful coped better with a life transition. Specifically, people who were more grateful before the transition were less stressed, less depressed, and more satisfied with their relationships three months later. Second, two recent studies have suggested that gratitude may have a unique relationship with well-being, and can explain aspects of well-being that other personality traits cannot.
Source: Wikipedia, Gratitude