Seaweed Increases Post-Menopausal Cancer Risk, Study Says

A new study from Japan suggests that post-menopausal women who eat seaweed regularly–just about every day, the report says–have a higher risk of developing thyroid cancer.

The new study linking regulary seaweed consumption to thyroid cancer in post-menopausal women comes from researchers at Tokyo-based National Cancer Center and researchers abroad. Researchers looked at data from a 14-year national survey of 50,000 women between the ages of 40 and 69.

The data showed that over those 14 years, 134 women developed thyroid cancer, 113 of which were cases of papillary carcinoma, a common type of thyroid cancer. Using this and other data, researchers are now saying that post-menopausal women who eat seaweed daily are 1.7 times more likely to develop some form of thyroid cancer, whereas those who ate seaweed only twice a week showed very little, if any, increased risk.

“It is believed that the increased risk (of developing thyroid cancer from seaweed consumption) after menopause is related to changes in female hormone concentrations,” says Takehiro Michikawa, a member of the research team and a specialist in public health and epidemiology at the National Institute for Environmental Studies (NIES). “We’d like to conduct further research. Post menopausal women should take care not to eat too much seaweed.”

via Mainichi (English)

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