2024-02-16 05:45:13
New research has linked physical inactivity to at least 13 types of cancer, with more than three times more cancer cases in Australia being linked to physical inactivity than previously thought. (Buda Mendes/Getty Images)
[The Epoch Times, February 16, 2024](Epoch Times reporter Xiao Jie compiled and reported from Sydney, Australia) New research shows that cancer cases in Australia due to lack of physical activity are more than three times more than previously thought.
The study’s senior author, Associate Professor Brigid Lynch from the Cancer Council, found growing evidence linking physical inactivity to at least 13 types of cancer, not just 13 types of cancer as researchers once thought. Three types. She hopes to update the estimate based on activity levels and cancer rates among Australians.
Since a database tracking cancer diagnoses was created in Australia 40 years ago, the line on the graph has been climbing steadily. In 1982, there were fewer than 50,000 cases in a year, while in 2021, there were more than 150,000 cases.
Since then, growing knowledge has shown that 30% to 50% of cancer cases are preventable and are caused by modifiable factors such as smoking, poor diet, alcohol consumption, infections, overweight and physical inactivity Caused.
According to the Sydney Morning Herald, this new study was funded by the Victorian government and published in the Journal of Science and Medicine in Sport. Researchers looked at Australians’ physical activity data and the incidence rates of these 13 cancers 10 years later. The researchers then conducted analyzes to control for confounding factors and determine how much physical activity would protect against these cancers.
They estimated that 6,361 cases of cancer diagnosed in 2015 (nearly 5%) could be attributed to physical inactivity.
This is 3.5 times higher than previous estimates for breast cancer, colon cancer, bladder cancer, endometrial cancer, kidney cancer, esophageal adenocarcinoma, gastric cancer, non-Hodgkin lymphoma, head and neck cancer, myeloma, bone marrow leukemia, liver cancer and gallbladder cancer.
Lynch said thousands of diseases can be prevented by simply increasing physical activity by 30 to 40 minutes per week. “But the more you do, the better. For prevention, the Cancer Council recommends that people be active for about 300 minutes a week, or about an hour a day, five days a week… This can be built up by doing many small amounts of activity every day. “
Experts are still trying to understand the mechanism, but they know that sex hormones, such as sex hormones, play a role in endometrial and breast cancers, which are increasing in both men and women.
“Physical activity reduces the amount of circulating estrogen, which is strongly associated with estrogen receptor-positive breast cancer, a common type,” Lynch explained.
Physical activity also improves body composition, which is important because fat tissue increases estrogen levels.
Researchers found that people with metabolic diseases, including poor insulin signaling or type 2 diabetes, were more likely to develop colorectal cancer, and that physical activity increased insulin sensitivity.
There’s also inflammation, which plays a role in the development of many cancers.
“Our skeletal muscles produce anti-inflammatory peptides that are excreted from the body during exercise,” Lynch said. “This may be a way to gain more skeletal muscle through activity and help reduce inflammation.”
Professor Rob Newton, deputy director of the Institute of Sports Medicine at Edith Cowan University (ECU), said while any type of activity can reduce risk, in the context of cancer suppression, the significance of muscle mass may make regular exercise Resistance training becomes particularly effective.
He added that physical activity has a “huge impact” on the function of the immune system. “When you have a more efficient, surveillance system that can identify and destroy these precancerous cells, they will never develop into malignant tumors.”
Despite this, physical activity has been little emphasized in cancer prevention. “This is something we really need to focus on… We can’t keep treating these things with drugs,” Newton said.
Ainslie Sartori, deputy chair of the Cancer Council’s nutrition, alcohol and physical activity committee, said while the data was “shocking”, the findings were not surprising. “These findings could prove crucial for cancer prevention policies that promote physical activity among Australians.”
Currently, there is no national physical activity plan to inform governments to establish systems that promote people to stay active, such as making cities less car-centric, improving cycle lanes, and increasing public transport and green spaces.
Sartori and Lynch are urging the government to implement the National Preventive Health Strategy (NPHS), which recommends developing a physical activity policy and encouraging and helping people to be more active through urban design, education and support.
“Promoting better physical activity environments and supporting Australians to develop better habits will help reduce their risk of cancer later in life and ultimately save lives,” Sartori said.
Editor in charge: Yue Ming
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