When reading about the pros and cons of dietary supplements,
most people don’t think about ordinary multivitamins. These have been recommended and taken by
children and adults for years. Anyone
who does not eat the perfect diet, we are told, must take a vitamin to make up for any possible deficiency.
Long before ginseng, St. John’s wort, chondroitin and other more exotic
supplements entered mainstream America, the daily multivitamin and mineral
tablet (MVM) was accepted as part of a wise, preventive health regime. More than a third of Americans spend over $5
billion, each year on ordinary multivitamins.
That cost excludes high-dose options and other combinations of vitamins
and minerals.
Although people, including health professionals, tend to view MVMs
as a safe, inexpensive insurance policy, NBC news republished a report earlier this week from Prevention Magazine on two “massive studies" that cast
doubt on that assumption and on the wisdom of our $5 billion expenditure.
“The first, a review of 63 randomized, controlled trials
(the gold standard research method) on multivitamins, published by the Agency
for Healthcare Research and Quality, found that multis did nothing to prevent
cancer or heart disease in most populations (the exception being developing
countries where nutritional deficiencies are widespread).” Another study from 2012 “followed 160,000
postmenopausal women for about 10 years,” and concluded: "Multivitamins failed to prevent cancer,
heart disease, and all causes of death for all women. Whether the women were
healthy eaters or ate very few fruits and vegetables, the results were the
same."
The same article makes other surprising observations. A “review of eight studies found no evidence
that multis reduced infections in older adults. Another study found that the
vitamins didn't improve fatigue among breast cancer patients undergoing
radiation therapy. And inner-city schoolchildren who took a multi did not
perform any better on tests or have fewer sick days than students who didn't
take one.”
A second source, the government's National Institute of
Health backs up these claims with a more detailed account of those studies and
others; and it goes even further, giving examples of how use of MVMs can lead
to unsafe high levels of certain vitamins in specific cases. One finding it points out is that “investigators
found that use of MVMs did not reduce the risk of any chronic disease.”
Since they are dietary supplements and not regulated by the
FDA, they cannot claim to cure diseases.
As I have mentioned before, it’s left up to us to find reliable
information regarding their safety and effectiveness. Since MVMs are sold by large, reputable
companies, there should be little concern about their safety, per se; and fortunately, their high popularity leads to
many independent studies, separating facts from assumptions and advertising.
The latest news about MVMs agrees with the federal
government's 2010 Dietary Guidelines: "nutrients should come primarily from
foods...Dietary supplements…may be advantageous in specific situations to
increase intake of a specific vitamin or mineral." Surprisingly, the population that takes MVMs tends to be better educated and take better care of themselves anyway: keeping their weight down, drinking and
smoking less, exercising more and getting regular checkups. With a few exceptions, pregnant women for
example, most who take them don’t really need them. Couldn’t a substantial chunk of that $5
billion be put to better use?
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