Mega doses of vitamin E don't affect the risk of heart disease
or cancer, but may increase the risk of heart failure, researchers
say. After conducting the seven-year study of close to 4,000 patients,
they say there's no reason for people to take high-dose vitamin
E supplements.
Some 22 percent of adults over the age of 55 take vitamin E supplements,
as studies in the '90s showed it may have protective heart benefits.
More recent studies have not found the same results, and this study
found high-dose vitamin E might actually increase the risk of heart
failure, which occurs when the heart muscle is unable to pump blood
effectively.
It was found that 14.7 percent of patients taking high-dose vitamin
E supplements (400 international units (IU)) suffered from heart
failure after seven years, compared to 12.6 percent of those taking
placebos.
Multivitamins generally contain only 30 IU of vitamin E, while
individual supplements can contain over 400 units. Researchers said
the small amount of the vitamin in a multivitamin poses little risk,
and other studies have suggested that low doses may actually be
beneficial to Alzheimer's disease, age-related macular degeneration
and cataracts.
Studies are underway to determine whether vitamin E may prevent
specific types of tumors (if not cancer overall) and whether vitamin
E taken together with selenium prevents prostate cancer. In conclusion,
researchers say that a pill to prevent cancer and heart disease
just doesn't exist--instead, diet, exercise and body weight must
be given attention.
Journal
of the American Medical Association March 16, 2005;293(11):1338-1347
USA
Today March 16, 2005
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