Women who are in the best physical form in the morning are less likely to develop breast cancer compared to those who are active in the evening, according to a study in the United Kingdom, quoted by the Press Association.
Researchers who identified the association between morning or evening preference and the risk of developing breast cancer found evidence of a causal relationship between prolonged sleep and this disease, writes agerpres.ro.
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Scientists who compared data from hundreds of thousands of women showed that those who are more active in the morning have a 40-48% lower risk of developing breast cancer.
The analysis also showed that women who sleep more than the recommended sleep time – from seven to eight hours at night – are at risk of being diagnosed with this condition, which increases by 20% with each additional sleeping period.
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The study looked at the differences between genetically predisposed individuals to be "smugglers" and those who are "owls". The first one tries to wake up early and the "owls" have an inner clock that makes them equal in the early hours of the day and have greater energy in the evening.
"Based on genetic variants associated with morning or evening preference, sleep and insomnia, we asked to find out if these sleeping qualities have a causal role in the development of breast cancer," said Dr. Rebecca Richmond, senior researcher at the University of Bristol, UK.
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The specialist said he intends to continue studying the mechanism that supports these results and added that "changing habits may not lead to a change in the risk of developing breast cancer, things can be more complicated than that.
"But the discovery of the protective effect of morning preference for breast cancer risk is in line with previous studies that emphasize that night work and exposure to" night light "are the risk factors for breast cancer," Richmond said.
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The discovery was presented at the annual conference of the National Cancer Institute in the UK, held in Glasgow.
The survey was conducted on 180,215 participants from the UK Biobank project, which stores data for medical research of 500,000 people. The analysis also included the results of 228,951 women who participated in an international genetic study run by the Consortium of the Breast Association (BCAC).
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