Owl or lark? Morning people have a lower risk of breast cancer

Owl or lark? Morning people have a lower risk of breast cancer

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Study: Early risers have a lower risk of breast cancer

A new study has shown that women who belong to the so-called morning types (larks) have a lower risk of breast cancer. The researchers also found evidence of a causal link between longer sleep and breast cancer.

Risk factors for breast cancer

Breast cancer, also called breast cancer, is the most common malignant tumor in women. In Germany alone, up to 70,000 new cases are counted each year. As with most other cancers, the actual causes are unknown. However, some breast cancer risk factors are known. The risk increases with age, among other things, through family history, genetic changes and smoking. Much body fat and lack of sleep are also associated with an increased risk of breast cancer. A recent study by British scientists has also shown that there is a connection between sleep and breast cancer risk.

"Larks" have a lower risk of breast cancer than "owls"

Day or night people: There are so-called morning types (larks) who wake up early and are quick to perform, and evening types (owls) who are awake and active for a long time in the evening.

The former apparently have a health advantage. Because, as a study by the University of Bristol (Great Britain) has shown, women who are "larks" have a lower risk of breast cancer.

The study, which looked at data from over 400,000 women and examined whether the way people sleep can contribute to the development of breast cancer, also found evidence of a causal link between longer sleep and breast cancer.

The results of the investigation were published on the preprint server "BioRxiv".

Increased risk from longer sleep

In order to arrive at their results, Dr. Rebecca Richmond of the University of Bristol and her colleagues shared the data of 180,215 women enrolled in the UK biobank project and 228,951 women who were part of a breast cancer study conducted by the International Breast Cancer Association Consortium (BCAC).

The scientists found that the breast cancer risk of the “lark” women in the BCAC examination was 40 percent lower than that of the “owls”.

It was also found that women who slept longer than the recommended seven to eight hours were at higher risk for the condition.

Analysis of data from British biobank women showed similar results. In the morning types, the risk of breast cancer was reduced by 48 percent.

Effects of night shift work

"We would like to continue working on the mechanisms underlying these results, as the estimates are based on morning or evening preference issues rather than whether people get up earlier or later in the day," said Dr. Richmond in a message.

In other words, breast cancer risk may not be changed by changing habits, it could be more complex.

"However, the results of a protective effect of morning preference on breast cancer risk in our study are consistent with previous research that highlighted a role for night shift work and exposure to" light at night "as risk factors for breast cancer," said the study author.

Consequences for influencing sleeping habits

The researchers believe that their results have an impact on policy makers and employers.

"These results have potential policy implications for influencing the population's sleeping habits to improve health and reduce the risk of breast cancer in women," said Dr. Richmond.

The scientists are now planning to investigate the mechanisms underlying the effects of various sleep characteristics on the risk of breast cancer.

"We want to use genetic data from large populations to better understand how the disruption of the natural body clock can contribute to the risk of breast cancer," said the researcher.

Cliona Clare Kirwan of the University of Manchester, who was not involved in this research, said: “We already know that night shift work is associated with a deterioration in mental and physical health. This study provides further evidence that disturbed sleep patterns can play a role in cancer development. ”(Ad)

Author and source information

Video: Could morning people have a lower risk of breast cancer? GMA (June 2022).


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