A study based on the medical records of more than 45,000 women found a positive correlation between permanent hair dye and breast cancer—particularly among those who are black.
While the paper is based on patterns and trends and, as such, doesn't confirm a direct cause, it adds to research suggesting there may be carcinogens lurking in commonly-used beauty products.
This increased even further, to 60 percent, among black women who heavily used hair dye, defined in this case as once every five to eight weeks. The associated risk for white women, in contrast, was 7 percent for regular use and 8 percent for heavy use. However, in this case, the risk was consistent, increasing across all races by 30 percent for women who use chemical hair straighteners every five to eight weeks or more. Though, as the study authors point out, this is likely to affect black women more as chemical straighteners are used by black women more than they are by white women.
"I would also point out that the combination of obesity, consuming too many calories and lack of physical activity has a much higher relative risk for breast cancer in both black and white women," said Brawley, a former Chief Medical and Scientific Officer of the American Cancer Society.
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