Prolonged TV viewing linked to 8 leading causes of death in US

http://www.eurekalert.org/pub_releases/2015-10/ehs-pt102715.php

Public Release: 27-Oct-2015
Prolonged TV viewing linked to 8 leading causes of death in US
In addition to cancer and heart disease, many hours of TV viewing associated with risk for 6 other causes of death, according to a new study published in the American Journal of Preventive Medicine
Elsevier Health Sciences

On average, 80% of American adults watch 3.5 hours of television per day and multiple observational studies have demonstrated a link between TV viewing and poorer health. In this new study published in the December issue of the American Journal of Preventive Medicine, investigators reported an association between increasing hours of television viewing per day and increasing risk of death from most of the major causes of death in the United States.

Virtually all Americans (92%) have a television at home and watching TV consumes more than half of their available leisure time, potentially displacing more physical activities. Previous studies had reported a relationship between TV viewing and elevated risk of death from cancer and cardiovascular disease. In this study, researchers at the National Cancer Institute looked at more than 221,000 individuals aged 50-71 years old who were free of chronic disease at study entry. They confirmed the association for higher mortality risk from cancer and heart disease. In addition, they identified new associations with higher risk of death from most of the leading causes of death in the U.S., such as, diabetes, influenza/pneumonia, Parkinson's disease, and liver disease.

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The study found that compared to those who watched less than one hour per day, individuals who reported watching 3-4 hours of television watching per day were 15% more likely to die from any cause; those who watched 7 or more hours were 47% more likely to die over the study period. Risk began to increase at 3-4 hours per day for most causes they examined. The investigators took a number of other factors into consideration that might explain the associations observed, such as caloric and alcohol intake, smoking, and the health status of the population, but when they controlled for these factors in statistical models, the associations remained.

Another important finding of the study is that the detrimental effects of TV viewing extended to both active and inactive individuals, "Although we found that exercise did not fully eliminate risks associated with prolonged television viewing, certainly for those who want to reduce their sedentary television viewing, exercise should be the first choice to replace that previously inactive time," said Dr. Keadle.

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