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Although no significant differences were found in relation to the ethnicity of the people, the authors emphasize how the phenomenon may have more weight for black and African American womenaccustomed to using straightening products from a very young age.
Other factorsthey can also contribute to an increased risk of developing uterine cancer. White and colleagues noted how susceptibility could be increased in women who do little physical activityin which the levels of steroid hormones and latent chronic inflammation are higher.
There is no evidence of causality
As pointed out by the authors themselves, the survey it does not establish a cause-and-effect linkbut highlights a statistically significant association, which suggests the possibility that some components of the smoothing products, absorbed by the skin, have harmful effects on the endocrine system predisposing to the development of hormone-sensitive tumors. On the other hand, there was already some evidence that exposure to straighteners was related to an early menarche and altered levels of steroid hormones.
There is a lack of data on suspicious substances and exposure
Several substances that can mimic natural estrogen and progesterone are listed as suspicious (parabens, phthalates, bisphenol A, cyclosiloxanes, diethanolamine and formaldehyde), but the study did not investigate the products used by women (therefore it is not possible to identify the ingredients exactly) nor did he evaluate theexposure in time.
This means that the correlation between the use of straightening cosmetics and the risk of uterine cancer just identified affects several variables which make it more difficult to grasp their meaning: since neoplasms can take a long time, years or decades, to develop, the cases identified today may have contributed to the use of formulations no longer on the market.
Country you go, legislation you find
Speaking of formulations and ingredients, another important information to contextualize the study (and therefore the possible risk incurred by people who use hair straighteners) is that it is an analysis carried out in United Statesin which there is a legislation different from the European and Italian one.
There formaldehydefor example, is a typical ingredient in hair straighteners: recognized as carcinogenic sure (it is inserted in group I of the Iarc since 2004), its use in cosmetics, together with that of paraformaldehyde and substances that release formaldehydeis carefully and strictly regulated in theEuropean Union from the Directive 76/768 / EEC.
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