Are the benefits of vitamin D overhyped

Another day, and another vitamin has failed to live up to all of its hype. This time it’s vitamin D.

cheap jordans in china The reality check is coming from two new cheap jordans website legit research reviews published in the Annals of Internal Medicine. cheap jordans cheap jordans nike in china

cheap air force The reviews, which looked at hundreds of previous studies of the «sunshine vitamin,» conclude cheap jordan website that there’s little evidence that vitamin D protects against cancer or heart disease. cheap air force

Cheap jordans They cheap retros also show that vitamin D doesn’t prevent fractures when it’s taken alone. Pairing vitamin D with extra calcium does appear to help prevent broken bones in the elderly, however. Cheap jordans

cheap jordans on sale «For many cheap jordans 1 years, the enthusiasm for cheap jordans men vitamin D has outpaced cheap jordans with free shipping the evidence,» says JoAnn Manson, MD, DrPH, who cheap white jordan shoes heads the division of preventive medicine at buy cheap authentic jordans online Brigham and Women’s Hospital in Boston. cheap jordans on sale

«The evidence is actually fairly thin,» especially for any benefits beyond bone health, she says.

cheap jordans for sale To help fill the knowledge gap, Manson is mounting a nationwide trial that will test vitamin D and fish oil for the prevention of heart attacks and cancer. She was not involved in the reviews. cheap jordans for sale

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cheap nike shoes In recent years, vitamin D has been touted as a nutritional superstar. cheap nike shoes

cheap jordans online womens jordans for cheap Beyond its well known role as a bone builder, studies have suggested that high levels of D, usually achieved by taking supplements, may do everything from reducing chronic pain to preventing the common cold. cheap jordans online

At the same time, other reports have found that as many as half of all adults have less than ideal blood levels of D.

That has sent sales of vitamin D blood tests and supplements soaring.

cheap jordans free shipping But experts say science doesn’t yet support the use of the high doses that many people may be taking. cheap jordans free shipping

Last year, the Institute of Medicine increased the recommended dietary allowance (RDA) of vitamin D for children and adults ages 1 70 to 600 international units (IU), and adults over 70 to 800 IU. But the agency also said many people already get that much from sun exposure and from foods like fish and fortified dairy products.

cheap jordans sale But the promise of D is so powerful that many policy makers continue to consider emerging evidence. Preventive Services Task Force, which is set to update its recommendations on vitamin D for cancer and fracture prevention in January. They commissioned one of these two new evidence reviews. cheap jordans sale

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cheap adidas For that review, researchers at Tufts University reanalyzed data from more than 40 studies on vitamin D. cheap adidas

cheap jordans from china They set out to answer several key questions: cheap jordans from china

cheap yeezys Does vitamin where to buy cheap jordan shoes online D, taken with or without calcium, affect the risk for cancer or broken bones?Are high or low blood levels of vitamin D linked to a person’s cheap but real jordans for sale risk for cancer or broken bones?Are there harms linked to taking extra D?Among several studies of vitamin D taken alone or with calcium, researchers say a high degree of statistical uncertainty made it impossible to tell whether taking supplements increased or decreased the cheap air jordan shoes risk of cancer. cheap yeezys

With respect to fractures, data from five other studies showed that vitamin D supplementation alone cheap jordans shoes , in doses ranging from 400 cheap jordans shoes for sale online to 1,370 IU daily, did not appear to reduce the risk of breaking a bone.

That picture changed when calcium was combined with vitamin D.

cheap Air max shoes Across 11 studies of more than 52,000 people who were followed from one to seven years, those taking 300 to 1,000 IU of vitamin D each day, along with 500 to 1,200 milligrams of daily calcium, saw their risk of breaking a bone drop by an average of 12% compared with those taking a placebo. cheap Air max shoes

To answer the second cheap jordans under 100 question, researchers relied on studies that looked at the relationship between blood levels of vitamin D and the risk for breast enoft.com , prostate, colorectal, or any kind of cancer.

cheap air jordan cheap authentic jordans for sale There was some evidence that higher blood levels of vitamin D might protect against colon cancer. cheap jordans website But there cheap jordans size 6y was no evidence that having a higher vitamin D level could protect a person against breast or prostate cancer. cheap air jordan

cheap jordans china In fact, some studies suggested that men who had buy cheap jordan shoes online higher levels of D had an increased risk for cancer death. The same did not appear to be true for women. cheap jordans china

Other possible harms included an increased cheap jordans eclipse risk for kidney stones and bladder stones seen in one study among women taking vitamin D supplements.