He knows more about What it does: Helps maintain strong and healthy bones by retaining calcium. Deficiency Signs: Joint pain or stiffness, backache, tooth decay, muscle cramps, hair loss…. and the effects of sunlight than anyone I know. He’s not a medical doctor but a PhD – in physics with an entire career at NASA. After retiring from NASA, he formed the non-profit organisation, £Sunlight, Nutrition and Health Research Center” in San Francisco to continue his work on the roles of diet and UVB/ vitamin D in reducing risk of chronic and infectious diseases.
He published a review of the role of vitamin D in risk of dementia in 2009 followed by several additional publications on vitamin D and Alzheimer’s disease and dementia. He has 284 publications regarding vitamin D listed at pubmed.gov.
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