Sources
Every source an article leans on gets its own page here — 51 in all, 30 of them peer-reviewed studies: what each one found in plain language, how it was designed, and what it does not show, because the gap between what a study says and what a product would like it to have said is where most wellness writing goes wrong. The articles citing them →
16–30 of 51 sources
The association between trait gratitude and self-reported sleep quality is mediated by depressive mood stateAnna Alkozei, Ryan Smith, Megan D. Kotzin, Debby L. Waugaman, William D. S. Killgore · Behavioral Sleep MedicinePeople with higher trait gratitude reported more sleep and more daytime energy - but the relationship ran through depressive symptoms. Grateful people had fewer depressive symptoms, which plausibly meant fewer pre-sleep worries, which meant better perceived sleep.
Opening Up by Writing It Down: How Expressive Writing Improves Health and Eases Emotional Pain (Third Edition)James W. Pennebaker, Joshua M. Smyth · The Guilford PressThe book-length account of expressive writing by the two researchers who built the field - Pennebaker ran the original 1986 experiment, Smyth ran the 1998 meta-analysis. It explains the protocol, what the evidence supports, and where writing does not help.
The effects of expressive writing interventions for patients with cancer: a meta-analysisPok-Ja Oh, Soo Hyun Kim · Oncology Nursing ForumPooling 14 trials and 1,718 cancer patients, expressive writing produced a significant but small improvement in cancer symptoms, while effects on psychological and cognitive outcomes were not significant. The authors conclude the standard writing protocol may simply be too light a dose.
The impact of a brief gratitude intervention on subjective well-being, biology and sleepMarta Jackowska, Jennie Brown, Amy Ronaldson, Andrew Steptoe · Journal of Health PsychologyTwo weeks of a gratitude practice increased hedonic well-being, optimism and sleep quality, and lowered diastolic blood pressure, compared with an active control that simply reported everyday events. Improvements in well-being tracked with better sleep and lower blood pressure - but showed no relationship with cortisol.
Effect of expressive writing intervention on health outcomes in breast cancer patients: a systematic review and meta-analysis of randomized controlled trialsChunlan Zhou, Yanni Wu, Shengli An, Xiaojin Li · PLOS ONEAcross 11 randomised trials with 1,178 breast cancer patients, expressive writing significantly reduced negative physical symptoms within three months - but showed no significant effect on psychological outcomes at any follow-up point, and the physical benefit did not persist past three months.
The effect of expressive writing intervention on psychological and physical health outcomes in cancer patients: a systematic review and meta-analysisRobert Zachariae, Mia S. O'Toole · Psycho-OncologyA null result worth knowing. Pooling 16 randomised trials of expressive writing in cancer patients and survivors, the authors found no statistically significant effect on psychological health, physical health, or quality of life - and the result held regardless of control condition, setting or cancer type.
Improving mental health in health care practitioners: randomized controlled trial of a gratitude interventionSheung-Tak Cheng, Pui Ki Tsui, John H. M. Lam · Journal of Consulting and Clinical PsychologyOne of the strongest gratitude journaling results on record. In a double-blind trial across five hospitals, practitioners who wrote gratitude diaries twice a week for four weeks reported lower depressive symptoms (d = -0.49) and substantially lower perceived stress (d = -0.95) three months later than controls.
Self-talk as a regulatory mechanism: how you do it mattersEthan Kross, Emma Bruehlman-Senecal, Jiyoung Park, Ozlem Ayduk and colleagues · Journal of Personality and Social PsychologyChanging one word changes how well you cope. People who referred to themselves by name or as "you" rather than "I" while thinking through a stressful event performed better under pressure by objective raters, felt less distress, and ruminated less afterwards.
Positive psychology interventions: a meta-analysis of randomized controlled studiesLinda Bolier, Merel Haverman, Gerben J. Westerhof, Heleen Riper, Filip Smit, Ernst Bohlmeijer · BMC Public HealthRestricting to randomised controlled studies only, positive psychology interventions produced small effects on subjective well-being (0.34), psychological well-being (0.20) and depression (0.23) - effects that remained small but statistically significant at three to six months' follow-up.
The differential effects of gratitude and sleep on psychological distress in patients with chronic painMei-Yee Ng, Wing-Sze Wong · Journal of Health PsychologyAmong 224 chronic pain patients, gratitude was linked to lower depression largely through a direct route, while its link to lower anxiety ran more strongly through sleep - suggesting gratitude and sleep act on distress by partly different paths.
Want to be happy? Be grateful - David Steindl-Rast at TEDGlobal 2013Br. David Steindl-Rast · TED (TEDGlobal 2013)A short talk arguing that the causal arrow runs the opposite way to the one people assume: it is not that happy people are grateful, but that grateful people become happy. A clear, free introduction to why anyone would bother keeping a gratitude journal at all.
Al-Ghazali on Patience and Thankfulness (Ihya' Book XXXII)Abu Hamid al-Ghazali, trans. Henry T. Littlejohn · Islamic Texts SocietyThe canonical Islamic treatment of gratitude as a practice: al-Ghazali analyses shukr into three parts — knowing the blessing, joy in the giver, and acting with what was given — making thankfulness something a believer does with mind, heart and hands, not a passing mood. Goodreads 4.47.
The Holy Bible, New International VersionBiblica / Committee on Bible Translation · Zondervan / BiblicaThe most widely read modern English translation of the Bible — the text in which most readers today meet the scriptures' running insistence on thanksgiving, from the Psalms' "Enter his gates with thanksgiving" to Paul's "give thanks in all circumstances." Goodreads community rating 4.63 across roughly 100,000 ratings.
How are habits formed: modelling habit formation in the real worldPhillippa Lally, Cornelia H. M. van Jaarsveld, Henry W. W. Potts, Jane Wardle · European Journal of Social PsychologyThe study behind the 66-day figure - and the study that refutes how it is used. Ninety-six people repeated a daily behaviour for 12 weeks; the median time to reach automaticity was 66 days, but the range ran from 18 to 254 days, so there is no universal number of days to build a habit.
Enhancing well-being and alleviating depressive symptoms with positive psychology interventions: a practice-friendly meta-analysisNancy L. Sin, Sonja Lyubomirsky · Journal of Clinical PsychologyPooling 51 interventions across 4,266 people, positive psychology exercises significantly improved well-being (r = .29) and reduced depressive symptoms (r = .31). Effects were larger for people who were depressed, older, or had chosen the intervention themselves.
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