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Men in both studies, on a diet devoid or nearly devoid of vitamin C, had blood levels of vitamin C too low to be accurately measured when they developed signs of scurvy, and in the Iowa study, at this time were estimated (by labeled vitamin C dilution) to have a body pool of less than 300 mg, with daily turnover of only 2.5 mg/day.
Vitamin C supplements among other dietary supplements at a US drug store. Vitamin C has a definitive role in treating scurvy, which is a disease caused by vitamin C deficiency. Beyond that, a role for vitamin C as prevention or treatment for various diseases is disputed, with reviews often reporting conflicting results.
Sleep problems in women can manifest at various stages of their life cycle, as supported by both subjective and objective data. [further explanation needed] Factors such as hormonal changes, aging, psycho-social aspects, physical and psychological conditions and the presence of sleeping disorders can disrupt women's sleep.
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Countries do not always agree on the amounts of vitamins needed to safeguard against deficiency. For example, for vitamin C, the RDAs for women for Japan, the European Union (called Population Reference Intakes) and the US are 100, 95 and 75 mg/day, respectively. [3] [5] [16] India sets its recommendation at 40 mg/day. [17]
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[12] [20] For vitamin C, the first symptoms of scurvy in experimental studies of complete vitamin C deprivation in humans have varied widely, from a month to more than six months, depending on previous dietary history that determined body stores. [55] Deficiencies of vitamins are classified as either primary or secondary.
Professor Jim Horne, director of Loughborough University's Sleep Research Centre, explains that "for women, poor sleep is strongly associated with high levels of psychological distress and greater ...