Women who are in the best physical shape in the morning are less likely to develop breast cancer compared to the more active people in the afternoon, according to a study in the United Kingdom, cited by the Press Association.
Researchers who identified the association between morning or night preference and the risk of developing breast cancer also found evidence of a causal link between prolonged sleep and this disease, writes agerpres.ro.
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Scientists who compared data from hundreds of thousands of women found that those who are most 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 sleeping time.
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The study noted the differences between genetically predisposed individuals to be "crickets" and those who are "owls." The first tends to wake up and go to bed early, while the "owls" have an internal clock that makes them feel tormented at the first hours of the day and have a high energy level at night.
"Based on the genetic variants associated with the preference of the night or the night, the duration of sleep and insomnia, we seek to discover if these sleep-related characteristics have a causal contribution to the risk of developing 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 by adding that "changing habits may not cause a change in the risk of developing breast cancer; Things can be more complex than that.
"But the discovery of a protective effect of morning preference on the risk of breast cancer is consistent with previous research that emphasizes that work by night shift and exposure to" night light "are 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 United Kingdom, held in Glasgow.
The research was conducted in 180,215 participants of the Biobank project in the United Kingdom that stores medical research data of 500,000 people. The analysis also included results of 228,951 women who participated in an international genetic study led by the Association of Cancer of Mama (BCAC) Consortium.
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