Positive Psychology and Gratitude Interventions: A Randomized Clinical Trial.

The purpose of this study was to assess the effect of a gratitude intervention on a community sample of adults in relation to aspects involving well-being and mental health. A randomized clinical trial was conducted with 1,337 participants, composed of an intervention group (Gratitude group, = 446), and two control groups (Hassles group, = 444 and Neutral Events group, = 447). Participants assigned to the intervention condition were asked to write daily gratitude lists for 14 days, listing moments they had been grateful for during the day.