New Zealand researchers have recently found through studies that maintaining the bone strength by the calcium supplement may adversely affect older women's hearts.

It was announced that researchers from the University of Auckland,in New Zealand have carried out a follow-up survey for 5 years among 1471 healthy women with an average age of 74. Among them, 732 women took one calcium tablet each day, while the other 739 women took an invalid placebo every day. The results show that, in 5 years, among women who have supplemented calcium, 31 women suffered from heart disease, while only 21 women suffered from heart disease among those who took invalid placebos.

Researchers at the University of Auckland pointed out previous studies believed that calcium supplement may prevent cardiovascular disease, because it can lower the contents of low-density lipoprotein cholesterol contained in blood (known as "bad cholesterol"). But their study found that, because the calcium supplement will increase the calcium contents in blood, thus speeding up the formation of sediments in the artery, which could lead to the increased risk of suffering from heart disease.

Researchers at the university of Auckland pointed out on the paper they published in the latest issue of "British Medical Journal" that the result of their study is not ultimate, but reseaches have shown that large calcium supplement is likely to cause side effects on the cardiovascular health,so the elderly women who need to supplement calcium should pay attention.

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