Positive Psychology

Research summary

• A foundational meta-analysis of randomized controlled trials found positive psychology interventions produce small-to-moderate improvements in wellbeing and reductions in depressive symptoms.
• This has been refined by intervention-specific meta-analyses: gratitude interventions show consistent small positive effects on wellbeing, loving-kindness and compassion meditation improve both positive and negative mental health outcomes and life satisfaction, and character-strengths-based interventions improve psychological wellbeing in patients with chronic illness.
• A meta-analysis in inflammatory bowel disease patients specifically found positive psychological interventions improved quality of life and some inflammation biomarkers, suggesting plausible physical as well as psychological benefit.
• As with meditation research, many underlying trials are small with heterogeneous protocols and control conditions, so the overall evidence is best characterized as moderate: real, replicated small-to-moderate benefits rather than large, robustly causal effects on health outcomes.