As a result, only one in 100 women who described themselves as wounded birds had breast cancer – compared to two in a hundred who thought they were evening dinners.
Dr. Rebecca Richmond of the Cancer Research Program UK and her colleagues evaluated data from a total of 180,215 women who provided information about their natural preferences for growth and sleep. The result: the probability of getting breast cancer was 40 percent lower than in the night.
At the same time, the team analyzed the genetic information of over 200,000 additional women. This statistical model, known as "Mendelian Randomization", showed that women whose genes cause early ruminants had a 48 percent lower risk of developing breast cancer.
Researchers pointed to a cancer conference in Glasgow that many factors can be involved if a person has breast cancer. In addition, the majority of women surveyed in the Bristol study were women of European descent.
But Richmond says, "Sleep is probably an important risk factor for breast cancer, but it's not as big as other known risk factors – BMI or alcohol, for example. We know that sleep is generally important to your health."
Her research results are an indication of sleeping habits in industrialized countries. Reasonable, adequate and restorative sleep helps maintain health and reduce the risk of breast cancer in women.
Breast cancer in Germany
Annually, around 69,000 new cases of breast cancer are by far the most common cancer among women in Germany. Almost 30 percent of those affected have less than 55 years of age at diagnosis. Mortality rate is 25 percent. The causes are hormones and hereditary factors, but also overweight, lack of post-menopausal exercises and alcohol.