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My plans to take vitamin D seemed well funded (lots of positive research these days about high vitamin D levels) and then I stumbled upon this article that promotes the views of Trevor Marshall. "The Truth About Vitamin D: Fourteen Reasons Why Misunderstanding Endures", by Amy Proal (a biologist), 15/09/2007 http://bacteriality.com/2007/09/15/vitamind/

In his recent essay, Trevor G. Marshall explores how vitamin D supplementation may be contributing to the current epidemics of obesity and chronic disease[1]. Unfortunately, he has overlooked many important papers that disagree with his hypothesis. This letter points out some of the omissions. The health benefits of vitamin D3 have been reviewed recently[2]. The benefits for bone health have been known for nearly a century. Benefits for cancer, infectious diseases, autoimmune diseases, and metabolic diseases have been identified in the past three decades.

I have been inundated with letters asking about Professor Marshall's recent "discovery." Some have written that to say they have stopped their vitamin D and are going to avoid the sun in order to begin the "Marshall protocol." The immediate cause of this angst is two publications, a press article in Science Daily about Professor Marshall's "study" (which is no study but simply an opinion) in BioEssays. Dr. Trevor Marshall has two degrees, both in electrical engineering

On 29th September, Dr Michael Holick appeared on the "Coast to Coast" radio show, hosted by George Noory: http://www.coasttocoastam.com/guest/holick-dr-michael/41323 As many of you can't afford a subscription to listen to the whole show, I have edited the broadcast into an MP3 file of short snippets, so that we can (intelligently) discuss what was said. There is a "beep tone" to separate each snippet of info. You can download it from: http://MarshallProtocol.com/video/Holick.mp3 First is the introduction, setting out Dr Holick's overview of Vit D.