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And reducing TV viewing to less than two hours every day might extend life by almost 1.4 years. If inactivity links to increased risk of disease, can inactivity also affect life expectancy? Yes, finds an analysis of research published in the journal BMJ Open.Ĭutting the amount of time we sit to fewer than three hours every day may add 2 years to the US life expectancy of adults. Now cancer is accepted as one of the extremely important non-communicable diseases related to physical activity." Sitting lowers life expectancy It was good to see cancer included in the list of non-communicable diseases studied, notes Friedenreich, who was among a small group of scientists studying this topic. The authors concluded that if the population as a whole were only 10 percent more active, this would prevent more than 533,000 deaths every year if the population was 25 percent more active, the world would prevent more than 1.3 million deaths each year. Together, inactivity caused more than 5.3 million of the 57 million deaths that occurred worldwide in 2008.
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The study determined that physical inactivity causes 6 percent of coronary heart disease 7 percent of type 2 diabetes 10 percent of breast cancers and 10 percent of colon cancers. And as the authors point out, these numbers likely represent the lower threshold of how many cancers could be prevented by becoming more active.” “ The Lancet team applied a lot of rigor, and these estimates are solid. “This is important science,” says Christine Friedenreich, PhD, of Alberta Health Services-Cancer Care, a leading researcher on the activity-cancer link who also spoke at last year’s AICR Annual Conference. Physical inactivity was defined as not meeting the World Health Organization guidelines, which match US guidelines: Adults should get at least 150 minutes of moderate-intensity aerobic activity each week, with muscle strengthening activities at least two days a week. The analysis quantified the effects of physical inactivity on heart disease, type 2 diabetes, and breast and colon cancers. Worldwide, one in ten cases of both breast cancer and colon cancer is due to a lack of physical activity, with inactivity as much to blame for the major non-communicable diseases as smoking or obesity, concluded an analysis published in The Lancet last week.
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It may make you want to walk around as you read. The growing body of research on how activity – and inactivity – affects cancer risk and overall health has gotten a lot clearer this month with the release of several notable studies. Inactivity's Links to Longevity, Cancer Risk and Health