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Item
#2
TV Increases Risk for Type
2 Diabetes in Men
Sedentary lifestyle indicated by prolonged TV watching is directly
related to risk.
BACKGROUND: Television (TV) watching, a major sedentary behavior
in the United States, has been associated with obesity. We
hypothesized that prolonged TV watching may increase risk for type
2 diabetes.
METHODS: In 1986, 37 918 men aged 40 to 75 years and free of
diabetes, cardiovascular disease, and cancer completed a detailed
physical activity questionnaire. Starting from 1988, participants
reported their average weekly time spent watching TV on biennial
questionnaires.
RESULTS: A total of 1058 cases of type 2 diabetes were diagnosed
during 10 years (347 040 person-years) of follow-up. After
adjustment for age, smoking, alcohol use, and other covariates,
the relative risks (RRs) for type 2 diabetes across increasing
quintiles of metabolic equivalent hours (MET-hours) per week were
1.00, 0.78, 0.65, 0.58, and 0.51 (P for trend, <.001). Time spent
watching TV was significantly associated with higher risk for
diabetes. After adjustment for age, smoking, physical activity
levels, and other covariates, the RRs of diabetes across
categories of average hours spent watching TV per week (0-1, 2-10,
11-20, 21-40, and >40) were 1.00, 1.66, 1.64, 2.16, and 2.87,
respectively (P for trend, <.001). This association was somewhat
attenuated after adjustment for body mass index, but a significant
positive gradient persisted (RR comparing extreme categories,
2.31; P for trend,.01).
CONCLUSIONS: Increasing physical activity is associated with a
significant reduction in risk for diabetes, whereas a sedentary
lifestyle indicated by prolonged TV watching is directly related
to risk. Our findings suggest the importance of reducing sedentary
behavior in the prevention of type 2 diabetes.
Arch Intern Med
2001 Jun 25;161(12):1542-8
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