Word: ius
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Unfortunately, that didn't happen. Reporting in the Journal of the National Cancer Institute, the study authors announce that taking vitamin D supplements does not affect breast-cancer rates. After a seven-year period, women who took 400 IUs of vitamin D daily had the same rates of breast cancer as those not taking the supplements. (See TIME's A-Z Health Guide...
...thing, the dose of vitamin D supplementation used in the trial, 400 IUs, was relatively low. In the years since the study began in 1993, nutritionists have learned much more about the critical role that vitamin D plays in a wide range of cellular functions, and many now recommend up to 2,000 IUs daily for adults. Most people get very little vitamin D from their diet - the richest sources of the vitamin are dairy products and green leafy vegetables - so supplementation is the only way to reach recommended levels. "Four hundred IUs is just not a lot," says...
...fact that calcium and vitamin D supplementation is now routine therapy for postmenopausal women to protect against bone fractures. So about 15% of the women in the placebo group were allowed to continue taking their vitamin D supplements for bone health (some were taking up to 600 IUs per day), which could explain why there was little difference between the two groups in breast-cancer rates. "This is a potential problem that confounds the results of this particular trial," says Dr. Powel Brown, a professor of medicine at Baylor College of Medicine and author of an editorial accompanying the study...
...unclear how much vitamin D kids really need. It depends on a host of factors: children with epilepsy, cystic fibrosis or celiac disease may need more than the 400 IUs the AAP is recommending; kids with darker skin or living at northern latitudes with less sun may also require more. That means, of course, parents should consult their own pediatrician about how much vitamin D to give, but says Gordon, "Vitamin D toxicity doesn't occur until at least 2,000 IU a day and maybe as high as 10,000, so they shouldn't be overly worried about giving...
...profit education Web site.” The updated pyramid, which is based on data from the Nurses’ Health Study and the Health Professionals Follow-Up Study, differs from the 2005 recommendation of the U.S. Department of Agriculture (USDA). For example, Harvard recommends 1,000 IUs of Vitamin D for most people, limits dairy intake to two servings a day, and adds sugar-sweetened products such as soda to the “use sparingly” section of the pyramid. Cheung said that the differences between the two pyramids could be explained by external factors. Unlike...