Exercise linked to lower risk of 7 cancers
Posted on January 3, 2020
Cancers of the kidney, liver, breast and colon may all be fended off by increased physical activity.
Exercise is linked to a reduced risk of seven types of cancer and the more physical activity the better, according to a study in the Journal of Clinical Oncology (December 2019), that looked at whether meeting the recommended physical activity guidelines had an effect on cancer risk.
In general, healthy adults are encouraged to engage in 2.5 – 5 hours a week of moderate-intensity activity, such as brisk walking or gardening.
Alternatively, up to 2.5 hours of vigorous activity — jogging, running, swimming laps, jumping rope or hiking — are recommended.
These “guidelines have largely been based on their impact on chronic diseases like cardiovascular disease and diabetes,” Alpa Patel, senior scientific director of epidemiology research at the American Cancer Society, said in a statement.
“These data provide strong support that these recommended levels are important to cancer prevention, as well.”
The study, from researchers at the American Cancer Society, National Cancer Institute and Harvard T.H. Chan School of Public Health, pooled data from nine studies, involving more than 755,000 adults.
Participants reported their leisure-time physical activity and were followed for a decade on average, to see if they developed 15 different types of cancer.
Meeting or exceeding the recommended guidelines goals was linked to a reduced risk of seven of those cancers. Among both men and women, the risk of kidney cancer was reduced by up to 17%, liver cancer by up to 27% and myeloma by up to 19%.
Among men, increased exercise was linked to up to a 14% reduced risk for colon cancer. Among women, more physical activity was associated with up to a 10% lower risk for breast cancer and up to an 18% lower risk of both endometrial cancer non-Hodgkin lymphoma.
The study was observational and the findings do not prove cause and effect. Indeed, it is possible people who exercise more also engage in other healthy lifestyle behaviours that may influence cancer risk.
But evidence is growing that physical activity may directly affect tumour growth: A 2016 study from the National Cancer Institute found people who exercised the most also had lower odds of developing cancers of the bladder, oesophagus, lung, rectum and stomach.
Exercise also helps protect against other diseases, including heart disease and Type 2 diabetes and has been shown to improve mood and sleep.
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