Cannabis use disorders linked to fewer digestive problems in schizophrenia patients but not in healthy people
In a Danish national register study, cannabis use disorders were associated with 16% lower risk of gut-brain disorders and 30% lower risk of IBD in people with schizophrenia, but not in matched controls.
Quick Facts
What This Study Found
Among 21,066 schizophrenia cases and 176,935 matched controls, cannabis use disorders in schizophrenia patients were associated with decreased risk of gut-brain interaction disorders (IBS, dyspepsia; HR 0.84, p=0.003) and inflammatory bowel disease (HR 0.70, p=0.045). These associations were not observed in healthy controls, suggesting an interaction specific to schizophrenia.
Key Numbers
21,066 schizophrenia cases; 176,935 controls; gut-brain disorders HR 0.84 (p=0.003); IBD HR 0.70 (p=0.045) in basically adjusted model; no associations in controls.
How They Did This
Nationwide Danish register-based study using time-varying Cox regression in 21,066 schizophrenia patients and 176,935 age/sex-matched controls, adjusted for alcohol/substance use disorders and parental education.
Why This Research Matters
The endocannabinoid system modulates both gut function and inflammation. This large-scale finding that cannabis specifically protects against digestive disorders in schizophrenia (but not healthy people) could reveal unique therapeutic mechanisms.
The Bigger Picture
The schizophrenia-specific effect is intriguing. People with schizophrenia may have altered endocannabinoid systems that respond differently to cannabis, or cannabinoid effects on the gut-brain axis may depend on underlying psychiatric neurobiology.
What This Study Doesn't Tell Us
Register-based (cannot determine cannabis type, dose, or route); cannabis use disorders are an extreme measure (does not reflect moderate use); IBD finding dropped below significance in fully adjusted model; unmeasured confounding possible.
Questions This Raises
- ?What mechanism explains the schizophrenia-specific protective effect?
- ?Would targeted cannabinoid therapy reduce GI comorbidity in schizophrenia patients?
Trust & Context
- Key Stat:
- 16% lower gut-brain disorder risk; 30% lower IBD risk in schizophrenia only
- Evidence Grade:
- Strong: large nationwide register study with matched controls and appropriate adjustments.
- Study Age:
- Published 2020.
- Original Title:
- Cannabis use disorders may protect against certain disorders of the digestive organs in people with schizophrenia but not in healthy controls.
- Published In:
- Psychological medicine, 50(3), 499-506 (2020)
- Authors:
- Olesen, Julie Aamand, Posselt, Christine Merrild(2), Poulsen, Chalotte Heinsvig, Nordentoft, Merete, Hjorthøj, Carsten
- Database ID:
- RTHC-02756
Evidence Hierarchy
Looks back at existing records to find patterns.
What do these levels mean? →Frequently Asked Questions
Does cannabis protect against digestive problems?
Only in people with schizophrenia, according to this study. Cannabis use disorders were linked to fewer gut-brain disorders and less IBD in schizophrenia patients, but no such associations appeared in healthy controls.
Why would this only apply to schizophrenia patients?
The authors suggest this could reflect unique endocannabinoid system alterations in schizophrenia that create a different response to cannabis, potentially offering new treatment targets.
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Cite This Study
https://rethinkthc.com/research/RTHC-02756APA
Olesen, Julie Aamand; Posselt, Christine Merrild; Poulsen, Chalotte Heinsvig; Nordentoft, Merete; Hjorthøj, Carsten. (2020). Cannabis use disorders may protect against certain disorders of the digestive organs in people with schizophrenia but not in healthy controls.. Psychological medicine, 50(3), 499-506. https://doi.org/10.1017/S0033291719000370
MLA
Olesen, Julie Aamand, et al. "Cannabis use disorders may protect against certain disorders of the digestive organs in people with schizophrenia but not in healthy controls.." Psychological medicine, 2020. https://doi.org/10.1017/S0033291719000370
RethinkTHC
RethinkTHC Research Database. "Cannabis use disorders may protect against certain disorders..." RTHC-02756. Retrieved from https://rethinkthc.com/research/olesen-2020-cannabis-use-disorders-may
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.