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JAMA Neurol 2013

25(OH)VD, insulin, glucose, GSH, protein carbonyl, and Malondialdehyde (MDA) assays Plasma levels of 25(OH)vitamin D were determined using an ELISA kit (Calbiotech, Spring Valley, CA), levels of insulin were determined using ELISA kits from ALPCO Diagnostics (Salem, NH)

This can create a vicious cycle: poor sleep worsens oxidative stress, and oxidative stress prevents your body from achieving deep sleep

In fact, in a study from Denmark, there was a trend for a protective effect for the variant (Leu) allele in lung cancer cases compared to controls (296), and, similarly, other studies have found a protective effect for the Leu allele (144, 399)