Meditation occupies an unusual position. It is simultaneously an ancient contemplative practice, a mainstream clinical intervention, and a subscription app market worth billions — and the claims made in the third context bear little relationship to the evidence in the second.
The good news is that there is a large, careful review that separates them.
The reference study
In 2014, Madhav Goyal and colleagues at Johns Hopkins published a systematic review and meta-analysis in JAMA Internal Medicine, commissioned by the US Agency for Healthcare Research and Quality.
They screened more than 18,000 citations and included 47 randomised trials with 3,515 participants. Crucially, they graded the strength of evidence formally, and they compared meditation against active controls — programmes matched for time, attention and expectancy — rather than against doing nothing.
That last detail is what makes this review worth trusting. Comparing meditation to a waiting list tells you almost nothing, because any structured programme with a supportive instructor produces improvement.
What it found
Moderate evidence of benefit for three outcomes, from mindfulness meditation programmes:
- Anxiety: effect size 0.38 (95% CI 0.12–0.64) at 8 weeks, falling to 0.22 (0.02–0.43) at 3–6 months
- Depression: 0.30 (0.00–0.59) at 8 weeks, 0.23 (0.05–0.42) at 3–6 months
- Pain: 0.33 (0.03–0.62)
Those are small-to-moderate effects. Real, measurable, and worth having — comparable in magnitude to some antidepressant trials — but not transformative.
Low evidence of improvement in stress and distress, and in mental health-related quality of life.
Low evidence of no effect, or insufficient evidence of any effect, on positive mood, attention, substance use, eating habits, sleep, and weight.
And a finding that should be quoted more often than it is: no evidence that meditation programmes were better than any active treatment — drugs, exercise, or other behavioural therapies.
Mantra meditation programmes, including transcendental meditation, showed low evidence of no effect or insufficient evidence of any effect on psychological stress and wellbeing outcomes.
Reading that honestly
Two conclusions follow, and they point in opposite directions.
Meditation works, modestly, for specific things. Anxiety, depressive symptoms and pain have moderate-strength evidence behind them, in trials with proper controls. That is more than can be said for most interventions in the wellbeing market.
Almost everything else claimed for it is unsupported. Sleep, attention, positive mood, eating habits — these are among the most common claims made by meditation apps, and they are the specific outcomes where this review found no effect or insufficient evidence.
The dose problem
Here is the detail that matters most practically, and that the app market has quietly buried.
The trials in this review used substantial programmes. Mindfulness-Based Stress Reduction — the most-studied protocol — runs eight weeks and involves over 20 hours of structured training, plus daily home practice. Other mindfulness trials provided roughly half that. Transcendental meditation trials were estimated at 16 to 39 hours over 3 to 12 months.
Those results cannot be equated with a five-minute session in an app, and researchers examining app marketing have said so directly. The benefits claimed by mindfulness apps reach beyond what the evidence supports, and the evidence they cite comes from programmes an order of magnitude larger than what the app delivers.
The review’s authors also noted that many included studies were short term, and that participants were unlikely to have reached the level of expertise needed to affect outcomes requiring mastery. Which cuts both ways: the modest effects observed may understate what long-term practice does. We do not know, because that trial has not been run.
What it is actually doing
The mechanism is not established, and Goyal said as much: it is unclear how meditation improves psychological wellbeing.
His suggested explanation is the most plausible one on offer, and it is worth stating because it reframes the whole practice. Mindfulness programmes may teach people to reduce the way they react to negative emotions and symptoms, lessening the effect those states have on them.
That is not the same as eliminating the emotions. It is closer to changing the relationship with them — noticing anxiety without being carried by it.
Which connects directly to the stress research: how a stressor is appraised appears to matter alongside the stressor itself. Meditation may be a training method for appraisal.
If you want to try it
Set the expectation correctly. You are not aiming to empty your mind or achieve calm. The practice is noticing that attention has wandered and returning it, repeatedly. The wandering is not failure — it is the repetition that constitutes the exercise.
Use a structured programme rather than an app, if you can. MBSR courses run in many places, including some NHS services, and the eight-week structure is what the evidence actually tested.
Ten to twenty minutes daily beats an hour occasionally. That is the pattern the trials used.
Give it eight weeks before judging. That is the timescale at which effects appeared.
Know that it is not for everyone. Adverse effects are under-reported in this literature — one analysis found potential adverse effects mentioned in the materials of only 2% of meditation apps. For a minority of people, particularly with a history of trauma, intensive practice can be destabilising. If it consistently makes you feel worse, stop, and say so to whoever is teaching it.
Where it fits
If the goal is stress, several things have better or equal evidence and are easier to sustain: physical activity, sleep, social connection.
Where meditation earns its place is as one option among those, with genuine evidence for anxiety, depressive symptoms and pain — not as the practice that unlocks everything else. It is a modest, real, unglamorous intervention.
Which, by now, should sound familiar. That description fits almost everything on this site that survives scrutiny.
This article is for general information and is not medical advice. If you are experiencing anxiety or depression that affects your daily life, speak to your GP — effective treatments exist and meditation is not a replacement for them. If you need someone to talk to now, Samaritans can be reached free on 116 123, at any hour.
Sources
- Goyal M, Singh S, Sibinga EMS, et al. Meditation programs for psychological stress and well-being: a systematic review and meta-analysis. JAMA Internal Medicine, 2014;174(3):357–368. https://www.ncbi.nlm.nih.gov/books/NBK179810/
- Full text: https://scottbarrykaufman.com/wp-content/uploads/2019/08/goyal2014.pdf
- From ancient contemplative practice to the app store: designing a digital container for mindfulness. https://arxiv.org/pdf/2006.09521
- Mindfulness-based interventions for psychiatric disorders: a systematic review and meta-analysis. Clinical Psychology Review, 2017. https://www.sciencedirect.com/science/article/abs/pii/S0272735817303847
- The effects of meditation, yoga, and mindfulness on depression, anxiety, and stress in tertiary education students: a meta-analysis. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6491852/
This article is for general information and is not medical advice. If a health problem is affecting your daily life, speak to your GP.
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