A new study has found that people with inflammatory bowel disease (IBD) tend to have lower vitamin D levels than those without the condition, and that levels drop further during flare-ups. Vance Health Hub reports on findings suggesting that blood vitamin D tests could, in future, help doctors track how active a person’s IBD is without the need for more invasive tests.
Background
IBD includes conditions such as Crohn’s disease and ulcerative colitis, both of which cause ongoing inflammation in the digestive system. Doctors currently rely on a mix of symptom reviews, blood tests, stool tests, and sometimes colonoscopies to check how active the disease is at any given time. Researchers have long been interested in whether simpler blood markers could give useful clues about disease activity, reducing the need for more invasive checks.
Vitamin D is best known for supporting bone health, but it also plays a role in how the immune system works. Previous research has suggested that people with IBD often have lower vitamin D levels than the general population, though it has not been clear whether this is linked to how active the disease is at the time.
What the study found
Researchers from the Medical University of Lodz in Poland compared vitamin D levels in 129 people with IBD and 102 people without the condition. According to the study authors, people with IBD had noticeably lower average vitamin D levels than those in the comparison group.
Within the IBD group, the difference was even more pronounced depending on whether the disease was active or in remission, meaning symptoms and signs of inflammation were well controlled. Those in remission had considerably higher vitamin D levels than those with active disease. This pattern held true for both Crohn’s disease and ulcerative colitis.
The researchers also looked at what might explain vitamin D levels in people with IBD. They reported that total vitamin D intake from food, use of vitamin D supplements, eating fish at least once a week, and being in remission were all linked to higher blood vitamin D levels.
Why this matters
These findings raise the possibility that a simple blood test for vitamin D could, alongside other established measures, help give doctors an additional noninvasive way to gauge how active a person’s IBD is. The study authors suggested that keeping vitamin D levels within a normal range might be associated with fewer complications and better chances of remission, though they were careful to note this is not yet proven.
Importantly, the researchers also pointed out that low vitamin D may be a result of active inflammation rather than a cause of it. This distinction matters because it is not yet clear whether raising vitamin D levels would directly improve disease activity, or whether low levels simply reflect what is already happening in the body during a flare.
What to keep in mind
- This was an observational study, meaning it looked at associations rather than proving cause and effect.
- Vitamin D levels alone should not be used to diagnose a flare or replace existing monitoring methods.
- Further research is needed to confirm whether correcting low vitamin D levels changes disease outcomes.
- Anyone with IBD concerned about their vitamin D levels should discuss testing or supplementation with their gastroenterology or dietetics team rather than making changes independently.
Reference
Godala M, et al. Serum 25-hydroxyvitamin D as a potential marker of disease activity in inflammatory bowel disease. Journal of Clinical Medicine. Published online 11 September (year and full volume, issue, page, and DOI details could not be confirmed from the source material provided).
This article is a journalistic summary for informational purposes only. It does not constitute clinical advice or a recommendation to alter treatment decisions.