Women who are in the best physical form in the morning are less likely to develop breast cancer compared to those who are more active in the evening, according to a study in the UK cited by the Press Association.
Researchers who identified a connection between morning or evening choices and the risk of breast cancer also found evidence of a causal relationship between prolonged sleep and the disease, writes agerpres.ro.
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Scientists who compared hundreds of thousands of women found that breast cancer is 40-48% lower in the morning for more active people.
The analysis also showed that women who spend more than the recommended time of sleep, from seven to eight hours per night, are at risk of being diagnosed with this condition, which increases by 20% with each additional sleep.
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The study looked at the differences between genetically predisposed individuals such as "crickets" and "owls." The first one wakes up and sleeps early, but the "owls" have an internal clock that allows them to feel tight at the beginning of the day and have a high level of energy in the evening.
"Based on genetic options related to morning or evening choices, sleep and insomnia, we tried to find out if these sleep-related properties have a causal effect on the risk of developing breast cancer," said Dr. Rebecca Richmond, Senior Researcher at Bristol University, UK.
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The specialist said that it is planned to continue exploring the mechanism supporting these results, adding that "changing habits may not change the risk of developing breast cancer, things may be more complicated than that.
"But the early detection of the choice of the protective effect of breast cancer is consistent with a previous study, which emphasizes that night shift work and night-time exposure are breast cancer risk factors," Richmond said.
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The discovery was presented at the National Cancer Institute's annual conference in the United Kingdom held in Glasgow.
The study was conducted with 180 215 participants from the UK Biobank project, in which data on medical research is stored by 500,000 people. The analysis also included results from 228,951 women participating in the International Genetic Study on Cancer (BCAC) consortium.
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