Can J Neurol Sci 38(1):98-105 (2011)
Scott Sloka, Claudia Silva, William Pryse-Phillips, Scott Patten, Luanne Metz and V Wee Yong
Department of Neurology, Grand River Hospital, Kitchener, Ontario, Canada.
Background: Multiple sclerosis (MS) is a disease with purported environmental causes. Consistent correlations have been found in various settings for latitude, smoking exposure, sunlight, and vitamin D deficiency. We analysed the contribution of various environmental factors to the risk of developing MS from a population perspective.
Methods: We collated global data of MS prevalence from 54 studies over the previous ten years and calculated the degree of risk contributed by latitude, longitude, ultraviolet radiation (from NASA satellite data and formulae for available sunlight hours), population smoking rates (from WHO data), gender, study date, study demographics, and several socioeconomic factors. We report a very significant negative correlation between MS prevalence and available ultraviolet (UV) radiation.
Results: The lack of available UV radiation outweighs other factors by at least 20 fold (p<10^-8) from single variate regression analysis. Multiple regression analysis revealed that latitude and longitude are also significant factors; smoking may also provide a very minimal role. The eight prevalence studies from Scandinavia produced prevalences that were lower than expected, given their global geospatial positioning.
Conclusions: The available ultraviolet radiation is a significant environmental factor, moreso than all the other factors examined. * PMID: 21156437
Items in both categories MS and UV are listed here:
- Multiple Sclerosis 2X more likely if low winter UV – June 2018
- Multiple Sclerosis half as likely if get plenty of sunshine (not a news item) – March 2018
- Clinically Isolated Syndrome progresses to Multiple Sclerosis, unless UVB treatments – RCT Dec 2017
- Vitamin D and Sun conference – Germany June 2017
- Multiple Sclerosis suppressed by an Ultraviolet wavelength not associated with Vitamin D (mice) – Nov 2016
- Multiple Sclerosis helped by UV – possibly via cytokines, etc. – Oct 2015
- Hypothesis – Multiple Sclerosis risk increases with low UV, viral infections, and antibiotics in childhood – March 2015
- How UVB reduces autoimmune diseases such as Multiple Sclerosis – April 2014
- UV decreases Multiple Sclerosis via cis-urocanic acid (and via vitamin D) – June 2013
- MS prevention by UV is 2X better than prevention by vitamin D levels – Jan 2012
- There is more in UV than vitamin D which suppresses MS in mice – April 2010
- UV produces more than vitamin D – Aug 2011
- Lack of UV 20X more associated with MS than any other variable – Dec 2010
- Hypothesis - more in sunshine than vitamin D to reduce MS – Feb 2010
- MS UV and Vitamin D – 2009
- Lack of UV increased offspring MS - April 2010
- Mouse MS: UVB but not Vitamin D reduced incidence - April 2010