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Home » Supplements Questioned
Breaking News

Supplements Questioned

News
October 11, 2011
KEYWORDS calcium / dietary / multivitamins / supplements / vitamin / Vitamins / women
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October 11/Minneapolis/Reuters -- Women taking multivitamins do not live longer than those who get their nutrients from food alone, according to a U.S. study that found they in fact appear to have slightly higher death rates.

About half of adult U.S. residents take dietary supplements, and the industry now boasts of annual sales as high as $20 billion. Yet research suggests that some of the largely unregulated substances, such as vitamins A and E, could be harmful in high doses, according to an editorial published with the study in the Archives of Internal Medicine.

“There is very little evidence showing that common dietary supplements would be beneficial in prevention of major chronic diseases,” said Jaakko Mursu of the University of Minnesota in Minneapolis, who worked on the study.

“Unless you are deficient, there is hardly any reason to take them,” he told Reuters Health.

Mursu and his colleagues used data from nearly 39,000 older women who participated in the Iowa Women’s Health Study and filled out questionnaires starting in 1986.

The survey asked about use of multivitamins, vitamins A, C, D and E as well as beta-carotene, B vitamins and minerals such as calcium, copper, magnesium, selenium and zinc.

During the study, supplements became increasingly popular. Between 1986 and 2004, the proportion of women who said they took one or more jumped from 63% to 85%.

Only calcium supplements were linked to a lower risk of death over 19 years of follow-up, with 37% of users dying compared to 43% of non users. That link held up even after considering that women taking supplements had a healthier lifestyle than the rest.

By contrast, women taking other supplements did not live longer. For instance, 41% of multivitamin users died versus 40% of non-users, and the gap became even wider when adjusting the numbers based on health problems like diabetes, high blood pressure and overweight in the two groups.

Mursu said he expects that his findings will be true for men as well, adding that they jibe with earlier research hinting that dietary supplements do little good in Western countries where vitamin deficiency is not common.

One possible exception is vitamin D, which one recent study suggests may help women live a little longer.

Mursu also cautioned that his study does not prove supplements cause harm.

“I would rather conclude that there is no evidence for benefits,” he said.

The 2010 U.S. dietary guidelines recommend getting nutrients from food, not supplements. However, women of reproductive age are advised to get extra folic acid and those who are pregnant may want to take iron supplements if their doctor suggests it.

The guidelines also urge people 50 and older to get extra vitamin B12 from fortified foods or supplements.

Duffy MacKay of the Council for Responsible Nutrition disagreed with the researchers’ conclusion that doctors should only recommend supplements to people with deficiencies.

He added that in the case of iron, women on high doses may have underlying conditions that could explain their higher death rates.

While Mursu acknowledged that shortcoming, he said it is unlikely to be relevant for multivitamins, which usually are not prescribed by a doctor.

 From the October 11, 2011, Prepared Foods' Daily News.

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