LONDON / The Telegraph / Health News / April 20, 2011
Older people who take calcium supplements to protect against bone fractures are putting themselves at increased risk of having heart attacks and strokes, new research indicates.
But critics said a study needed to look at taking both calcium and vitamin D supplements together. They are commonly recommended to be taken in conjunction because vitamin D helps calcium absorption.
Too much calcium in the blood raises "serum calcium levels" which can clog up arteries.
This new study, published today (WED) online in the British Medical Journal, provides evidence that calcium supplements do lead to an increased risk of cardiovascular problems, even when taken alongside vitamin D.
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Researchers from Auckland University in New Zealand and Aberdeen University looked at data from the Women's Health Initiative, an American observational study of women who had been through the menopause.
Looking only at those who were not taking supplements beforehand, they found that those taking one gram of calcium daily and 400IU (0.01 milligrams) of vitamin D, were at a 21 per cent higher risk of having a heart attack over seven years. They were also at a 20 per cent increased risk of having a stroke.
Cathy Ross, Senior Cardiac Nurse at the British Heart Foundation, described that as a "modest increase" but said patients with concerns should not stop taking them, but talk to their doctor instead
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