22 February 2012Last updated at 16:58 GMT By Stephanie Hegarty BBC World Service We often worry about lying awake in the middle of the night - but it could be good for you. A growing body of evidence from both science and history suggests that the eight-hour sleep may be unnatural. In the early 1990s, psychiatrist Thomas Wehr conducted an experiment in which a group of people were plunged into darkness for 14 hours every day for a month. It took some time for their sleep to regulate but by the fourth week the subjects had settled into a very distinct sleeping pattern.
To receive more information about up-to-date research on micronutrients, sign up for the free, semi-annual LPI Research Newsletter here. Vitamin A English | Español Vitamin A is a generic term for a large number of related compounds. Retinol (an alcohol) and retinal (an aldehyde) are often referred to as preformed vitamin A. Linus Pauling Institute at Oregon State University
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Magnesium Update Please Read Before Proceeding: I am not a physician, I am a clinical nutritionist and can not and do not prescribe. The information provided here is for educational purposes only. Any decision on your part to read and use this information is your personal choice.
What vitamin may we need in amounts up to 25 times higher than the government recommends for us to be healthy? What vitamin deficiency affects 70-80 percent of the population, is almost never diagnosed and has been linked to many cancers, high blood pressure, heart disease, diabetes, depression,(i) fibromyalgia, chronic muscle pain, bone loss and autoimmune diseases like multiple sclerosis?(ii) What vitamin is almost totally absent from our food supply? What vitamin is the hidden cause of much suffering that is easy to treat? Mark Hyman, MD: Vitamin D: Why You Are Probably NOT Getting Enough and How That Makes You Sick
To receive more information about up-to-date research on micronutrients, sign up for the free, semi-annual LPI Research Newsletter here. Vitamin D English | Español Vitamin D is a fat-soluble vitamin that is essential for maintaining normal calcium metabolism (1). Vitamin D3 (cholecalciferol) can be synthesized by humans in the skin upon exposure to ultraviolet-B (UVB) radiation from sunlight, or it can be obtained from the diet. Linus Pauling Institute at Oregon State University
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