A new study published in Alimentary Pharmacology and Therapeutics reports increased inflammatory bowel disease hospitalization and disease severity in areas of low ultraviolet light availability.
Inflammatory bowel disease (IBD) is characterized by inflammation in the digestive tract. The two main types of IBD are ulcerative colitis (UC) and Crohn’s disease (CD). UC occurs in the colon, a section of the large intestine, and often leads to chronic inflammation. CD can occur anywhere along the digestive tract and can spread deep within the tissue.
Research continues to find an association between vitamin D status and IBD. Vitamin D plays an important role in reducing and managing inflammation, and observational studies have found that low levels of vitamin D increases the risk for and severity of IBD.
The authors admitted that they DID NOT consider the effects of pollution nor haze.
Both pollution and haze have been found to greatly decrease UVB radiation.
See the study including charts, and pollution/uv at http://vitamindwiki.com/tiki-index.php?page_id=5529