In a recent report published in the Journal of American Medical Association (JAMA) based on a study conducted by researchers of the University of Southern Denmark, Harvard School of Public Health, Harvard Medical School, Brigham and Women's Hospital, Massachusetts experts observed that TV watching was one of the most prevalent and pervasive sedentary behaviours in industrialised countries.
The study
8 large prospective cohort studies from the United States, Europe, and Australia met the researchers' criteria and were included in the meta-analysis to determine the association between TV viewing and risk of type 2 diabetes, fatal or nonfatal cardiovascular disease and all-cause mortality(premature death).
Results
Of the studies included, 4 reported results on type 2 diabetes, 4 on fatal or nonfatal cardiovascular disease and 3 on all-cause mortality. The correlation between risk of type 2 diabetes and cardiovascular disease and time spent viewing TV was linear. All-cause mortality risk appeared to increase with greater than 3 hours per day of TV viewing duration.
For each additional two hours of TV viewing per day, the risk of type 2 diabetes, cardiovascular disease, and premature mortality increased by 20, 15, and 13%, respectively.
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