Here are some studies about vitamin D and inflammatory bowel disease:

Paediatric IBD Patients Do Not Meet the Daily Recommendations of Vitamin D and Calcium Intake: Survey Based Analysis in a Tertiary Centre (2017)

Conclusion: A survey of 151 pediatric inflammatory bowel disease patients found that 75% of the children had low vitamin D levels.

 

Higher Vitamin D Serum Concentration Increases Health Related Quality of lIfe in Patients with Inflammatory Bowel Disease (2014)

Conclusion: Quality of life (via questionnaires) and vitamin D levels were measured in 220 irritable bowel syndrome patients. Patients with higher vitamin D levels reported enjoying a higher quality of life compared to patients with lower levels.
 

Seasonal Variation in the Presentation of Abdominal Pain (2008)

Conclusion: 73,591 abdominal pain doctor visits over a three-year period in 6 different cities in America were analyzed. The rate of abdominal pain consultations rose significantly during the winter periods at all of the sites, this is when population vitamin D levels are typically the lowest. Vitamin D has been found to be important for immunomodulation, which would be an important factor for stomach/abdominal-related autoimmune disorders such as irritable bowel syndrome.

 

Treatment of Vitamin D Deficiency Due to Crohn’s Disease with Tanning Bed Ultraviolet B Radiation (2001)

Case Study: This crohn’s disease patient suffering from chronic vitamin D deficiency was prescribed to use a UVB tanning bed for 10 minutes three times per week. After only one month her vitamin D levels “increased by 357% from 7 to 32 ng/mL” and after six months of this she was cured of the musculoskeletal pains she was suffering.

 

1,25-Dihydroxycholecalciferol Prevents and Ameliorates Symptoms of Experimental Murine Inflammatory Bowel Disease (2000)

Conclusion: In an experiment involving infant mice, engineered vitamin D deficiency was found to be deadly for the pups. Dissection revealed that one fatal vitamin D-deficiency symptom was severe inflammatory bowel disease, which induced diarrhea in the pups. The vitamin D-deficient pups were also growth retarded compared to vitamin D-sufficient mice.

 

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