The Benefits of Journaling: What the Research Actually Says

9 min read · Updated 2026-10-11

Also available in: SKDEESHI

Journaling is often sold as a cure for almost everything. The research is more interesting – and more modest – than that. Here's what decades of studies actually found, where the evidence is weak, and what it means if you'd rather speak than write.

Where it started: Pennebaker's expressive writing

Modern journaling research traces back to psychologist James Pennebaker. In a 1986 study with Sandra Beall, published in the Journal of Abnormal Psychology, university students wrote for about 15 minutes a day, on four consecutive days. Some wrote about traumatic or deeply upsetting experiences; others wrote about superficial topics. In the months that followed, students who had written about their deepest thoughts and feelings visited the campus health centre less often than the comparison group.

This became known as the expressive writing paradigm, and hundreds of studies followed it. The basic idea: putting difficult experiences into words – rather than keeping them inside – may help people process them.

What the meta-analyses say

Single studies can mislead, so researchers combine many of them in meta-analyses. Two are especially often cited:

• Smyth (1998) combined studies of written emotional expression in healthy participants and found significantly improved outcomes in reported physical health, psychological well-being, physiological functioning and general functioning. Health behaviours didn't change. Notably, writing also increased distress immediately after writing – a short-term dip that was unrelated to the later benefits.
• Frattaroli (2006), published in Psychological Bulletin, analysed 146 randomised studies. The conclusion: disclosure is effective, with a positive and statistically significant – but small – average effect (r = .075). The size of the effect depended on a number of factors, such as how the task was set up.

If you want a readable overview of this research and how it is used in practice, the 2005 review by Baikie and Wilhelm in Advances in Psychiatric Treatment is a good starting point.

What "small" means here

An average effect of r = .075 means journaling is not a dramatic, life-changing intervention for the average person in an average study. It's a modest, real effect – and modest effects matter when the intervention is free, takes minutes and has few downsides. It also means you should be sceptical of anyone promising that journaling will transform your life in a week.

Why might it help?

Researchers have proposed several explanations, and they're not mutually exclusive:

• Putting feelings into words. In a 2007 brain-imaging study, Lieberman and colleagues found that labelling emotions in words ("affect labelling") reduced activity in the amygdala – a brain region involved in emotional reactions – compared with other ways of processing the same images. Naming a feeling may take some of its edge off.
• Making sense of events. Turning a jumble of experiences into a story with causes and meaning seems to be part of the benefit.
• Less mental load. Thoughts we keep rehearsing in our heads can feel lighter once they're "parked" somewhere outside.

Does speaking work too?

This is the question that matters most for voice journaling, and the honest answer is that fewer studies have looked at it. One that did is Esterling et al. (1994), published in the Journal of Consulting and Clinical Psychology. Fifty-seven students were randomly assigned to:

1. talk about stressful events,
2. write about stressful events, or
3. write about trivial events (control),

in three weekly 20-minute sessions. Afterwards, both disclosure groups had better values on an immune marker than the control group – and the talking group had the best values of all. In content analysis, the talking group also showed the greatest improvements in cognitive change, self-esteem and adaptive coping strategies.

That's one study with 57 participants, so it shouldn't be over-interpreted. But together with the "affect labelling" research, it supports a simple conclusion: the benefit seems to come from putting your experiences into words – not from the pen. For a practical comparison, see Voice journaling vs. writing.

Gratitude journaling

A different branch of research looks at positive journaling. In Emmons and McCullough (2003), participants were randomly assigned to regularly list things they were grateful for, list hassles, or record neutral events. The gratitude groups showed higher well-being on several – though not all – of the measured outcomes, with the effect on positive mood being the most robust. We turn this into a practical spoken routine in Gratitude journaling out loud.

What the research does NOT show

• That journaling works for everyone. Effects are averages; some people benefit a lot, some not at all.
• That it replaces therapy or treatment. It doesn't, and good studies don't claim it does.
• That more is better. Many classic studies used just a few short sessions. Daily hour-long sessions aren't required.
• That it always feels good. Writing (or talking) about hard things can feel worse in the short term, as Smyth's analysis found.

Practical takeaways

1. Short sessions are enough. 5–20 minutes is in line with how most studies were designed.
2. Go beyond events. Expressive writing asks for thoughts and feelings, not just a log of what happened.
3. Try to make sense of it. Ask "why" and "what does this mean for me", not only "what happened".
4. Expect some discomfort. A temporary low after a hard entry is common. If it doesn't pass, take a break and talk to someone.
5. Choose the format you'll stick with. If speaking makes it easier to show up, the evidence gives you no reason to force yourself to write.

Ready to try? Start with our 7-day plan or pick a question from 60 voice journal prompts.

Sources

1. Pennebaker, J. W., & Beall, S. K. (1986). Confronting a traumatic event: Toward an understanding of inhibition and disease. Journal of Abnormal Psychology, 95(3), 274–281. doi:10.1037/0021-843X.95.3.274
2. Smyth, J. M. (1998). Written emotional expression: Effect sizes, outcome types, and moderating variables. Journal of Consulting and Clinical Psychology, 66(1), 174–184. doi:10.1037/0022-006X.66.1.174
3. Frattaroli, J. (2006). Experimental disclosure and its moderators: A meta-analysis. Psychological Bulletin, 132(6), 823–865. doi:10.1037/0033-2909.132.6.823
4. Lieberman, M. D., Eisenberger, N. I., Crockett, M. J., Tom, S. M., Pfeifer, J. H., & Way, B. M. (2007). Putting feelings into words: Affect labeling disrupts amygdala activity in response to affective stimuli. Psychological Science, 18(5), 421–428. doi:10.1111/j.1467-9280.2007.01916.x
5. Esterling, B. A., Antoni, M. H., Fletcher, M. A., Margulies, S., & Schneiderman, N. (1994). Emotional disclosure through writing or speaking modulates latent Epstein-Barr virus antibody titers. Journal of Consulting and Clinical Psychology, 62(1), 130–140. doi:10.1037/0022-006X.62.1.130
6. Emmons, R. A., & McCullough, M. E. (2003). Counting blessings versus burdens: An experimental investigation of gratitude and subjective well-being in daily life. Journal of Personality and Social Psychology, 84(2), 377–389. doi:10.1037/0022-3514.84.2.377
7. Baikie, K. A., & Wilhelm, K. (2005). Emotional and physical health benefits of expressive writing. Advances in Psychiatric Treatment, 11(5), 338–346. doi:10.1192/apt.11.5.338