The study done by IJC by used questionnaires sent to 47,650 participants that asked them how often they used temporary, semi-permanent, or permanent hair dye and chemical hair straighteners (i.e. relaxers, Brazilian Keratin treatments, etc.).
The Trump adminsitration plans to tighten work requirements for food stamp recipients, potentially leaving 688,000 without coverage; Virginia moves to suspend Medicaid work requirements; hair dye and hair straighteners were linked to an increased risk of breast cancer in a new study. On average, women are using chemicals for straightening their hair permanently or let us say every five to eight weeks.
The study was funded by the National Institutes of Health (NIH) and the National Institute of Environmental Health Sciences.
The study tracked 46,700 American women enrolled in a Sister Study, which recruited breast-cancer-free women whose sisters had been diagnosed with the disease.
They provided researchers with updates over a follow-up period of approximately eight years. Around nine percent of the participants were African American women.
Among almost 47,000 women with sisters diagnosed with breast cancer, researchers from NIEHS and the University of North Carolina identified a significant increase in incidences of the disease among those who dyed or straightened their hair frequently.
Black women who used permanent hair dye had a 45% higher risk of breast cancer, compared to non-users.
The study published online on December 4 in the International Journal of Cancer found that women who used permanent hair dye and chemical hair straighteners were 9% more likely to develop breast cancer than those who did not. A new study suggests they could. Still, experts call for more research. The study was published Wednesday in the International Journal of Cancer.
Williams says that all chemicals come with a risk. Also, black women have more chances of cancer as compared to white women.
For perspective, across the United States about 1 in 8 women will develop an invasive breast tumour over their lifetime.
Even the researchers admit that the study, while noteworthy, must be taken in greater context. "It is for certain that obesity, consuming too many calories and lack of exercise is a risk factor for breast cancer, a definite risk factor", he says, while the findings of this study only add up to a "perhaps" when it comes to risk.