Lead researcher Professor Declan Naughton, from Kingston University's School of Life Sciences, said the results had revealed some important facts. Alzheimer's patients who were not using medication had very poor stores of vitamin D2 -- the type originating from food such as oily fish, rather than that obtained from exposure to the sun. "The vitamin was either non-existent or in such low quantities that it could barely be measured," he explained. "In comparison, people in the study who were either being treated with drugs to control their Alzheimer's or who didn't have the condition at all showed far higher levels."
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