# Source note — Laughter, life expectancy, humour and mortality research

**Prepared for:** NewsForBC Saturday feature  
**Publication date:** 2026-07-11  
**Article slug:** `laughter-life-expectancy-good-humour-research.html`  
**Source-card image:** `assets/images/bc-news/laughter-life-expectancy-source-card.svg`

## Editorial framing

This is a good-humour / public-health literacy feature, not medical advice. The safest headline claim is:

> Several cohort studies associate more frequent laughter or a stronger sense of humour with better survival, lower disability risk, or better cardiovascular profiles, but there is no validated formula that says laughing a specific number of times adds a specific number of years to life.

## Core evidence labels

- **Strongest direct laughter/mortality study:** Yamagata Study, 17,152 Japanese adults aged 40+, median 5.4-year follow-up. Low laughter frequency (`<1/month`) was associated with higher all-cause mortality vs laughter at least weekly: HR 1.95, 95% CI 1.16–3.09.
- **Older-adult disability study:** JAGES cohort, 14,233 Japanese adults aged 65+. Never/almost-never laughing was associated with higher functional disability risk vs almost daily laughter: HR 1.42. No significant all-cause mortality association over 3 years.
- **Sense-of-humour survival evidence:** HUNT Norway studies linked cognitive sense-of-humour scores with survival and lower cause-specific mortality in some groups.
- **Broader well-being evidence:** Chida & Steptoe meta-analysis found positive psychological well-being associated with lower mortality in initially healthy populations: HR 0.82.
- **Caveat:** Observational studies cannot prove laughter itself causes longer life. Laughter may also be a marker of social connection, mood, baseline health, coping ability and lower isolation.

## Main studies to reference

1. **Yamagata Study** — Associations of Frequency of Laughter With Risk of All-Cause Mortality and Cardiovascular Disease Incidence in a General Population. *Journal of Epidemiology*, 2020. PMID: 30956258. DOI: 10.2188/jea.JE20180249. Open access: https://pubmed.ncbi.nlm.nih.gov/30956258/ / https://pmc.ncbi.nlm.nih.gov/articles/PMC7064551/
2. **JAGES prospective cohort** — Does Laughter Predict Onset of Functional Disability and Mortality Among Older Japanese Adults? *Journal of Epidemiology*, 2021. PMID: 32418940. DOI: 10.2188/jea.JE20200051. Open access: https://pubmed.ncbi.nlm.nih.gov/32418940/ / https://pmc.ncbi.nlm.nih.gov/articles/PMC8021882/
3. **Cross-sectional JAGES cardiovascular study** — Laughter is the Best Medicine? A Cross-Sectional Study of Cardiovascular Disease Among Older Japanese Adults. *Journal of Epidemiology*, 2016. PMID: 26972732. DOI: 10.2188/jea.JE20150196. Open access: https://pubmed.ncbi.nlm.nih.gov/26972732/ / https://pmc.ncbi.nlm.nih.gov/articles/PMC5037252/
4. **CIRCS blood-pressure study** — Longitudinal Trends in Blood Pressure Associated With the Frequency of Laughter. *Journal of Epidemiology*, 2021. PMID: 32092749. DOI: 10.2188/jea.JE20190140. Open access: https://pubmed.ncbi.nlm.nih.gov/32092749/ / https://pmc.ncbi.nlm.nih.gov/articles/PMC7813767/
5. **HUNT 15-year study** — A 15-Year Follow-Up Study of Sense of Humor and Causes of Mortality. *Psychosomatic Medicine*, 2016. PMID: 26569539. DOI: 10.1097/PSY.0000000000000275. https://pubmed.ncbi.nlm.nih.gov/26569539/
6. **HUNT 7-year study** — A 7-year prospective study of sense of humor and mortality in an adult county population. *International Journal of Psychiatry in Medicine*, 2010. PMID: 20848871. DOI: 10.2190/PM.40.2.a. https://pubmed.ncbi.nlm.nih.gov/20848871/
7. **Positive well-being meta-analysis** — Positive psychological well-being and mortality: a quantitative review of prospective observational studies. *Psychosomatic Medicine*, 2008. PMID: 18725425. DOI: 10.1097/PSY.0b013e31818105ba. https://pubmed.ncbi.nlm.nih.gov/18725425/

## Practical public-facing summary

Laughter should be framed as a low-cost social and emotional health signal, not a magic intervention. In public-health terms, a loss of laughter can be a warning sign worth noticing: depression, pain, grief, caregiver strain, loneliness, chronic stress, illness or isolation can all reduce laughter. Encouraging safe, social, non-cruel humour may support community resilience even if the science does not prove extra years of life directly.