long periods of time should be avoided. In the U.K. and U.S., adults watch TV for around three to four hours a day on average," Stamatakis said. "This is simply too much, given that most of us have sedentary jobs, drive or commute by motorized transport and have lots of other opportunities (that we usually do not miss) to sit," he explained.
"Humans are not made to be sitting for the 10 to 11 hours that, on average, we do (and these 10 to 11 hours are in addition to sleeping)," he added. "Our evolution teaches us that our bodies are made to hunt and run away from our predators, not sit in front of a screen. We have completely ignored this side of our nature; therefore, it is not surprising that our bodies accumulate too much fat, get heart disease, cancer and type 2 diabetes. All these are direct consequences of too much sitting and not enough physical activity -- both, not either/or."
There's more on heart disease at the U.S. Centers for Disease Control and Prevention.
SOURCES: Robert Scott III, M.D., Ph.D., assistant professor of internal medicine, Texas A&M Health Science Center College of Medicine and senior staff cardiologist, Scott & White, Temple, Texas; Emmanuel Stamatakis, Ph.D., senior research associate, University College London, U.K.; Eugene Storozynsky, M.D., Ph.D., assistant professor of medicine, University of Rochester Medical Center, Rochester, N.Y.; March 3, 2010, presentation, American Heart Association's Joint Conference: Nutrition, Physical Activity and Metabolism, San Francisco
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