By WO Team

Each daily hour watching TV increases diabetic risk


This study was part of the Diabetes Prevention Program (DPP), a clinical research trial funded by the US National Institutes of Health (NIH) that involved more than 3,000 participants. It was reported in Diabetologia, a journal published by the European Association for the Study of Diabetes.

Lifestyle intervention previously recommended by the DPP had resulted in significant increases in physical activity level in individuals at high risk of developing diabetes. This study shows that that lifestyle intervention also reduced time spent in sedentary behaviour across demographic and BMI (Body Mass Index) specific groups.

In addition, results of this study show that time spent sedentary is related to diabetes incidence in the DPP study cohort, independent of physical activity levels. 

Researchers suggest that reducing time spent sitting may be included as a lifestyle intervention goal besides weight loss, dietary changes, and increasing physical activity levels. They indicate that even a modest reduction in sedentary time spent, such as watching TV, may lead to reduced diabetes incidence in high risk individuals.


The DPP lifestyle intervention goals were to achieve 150 minutes per week of moderate intensity activity, such as brisk walking, and a 7% weight loss. 

The DPP had previously demonstrated in sites across the US that people at risk for diabetes who lost weight and increased physical activity levels sharply reduced their risk. In fact, these people out-performed those who took a diabetes drug Metformin - diabetes incidence reduced by 58% with lifestyle intervention versus 31% with Metformin, when the two groups were compared to placebo with no intervention.

Prior to the trial, combined time spent on watching TV and sitting at work average nearly 7 hours a day for the participants. Those in the lifestyle intervention group reported reducing their combined TV watching and sitting at work time by 37 minutes per day, while the Metformin group reported only 6-minute reduction and the placebo group reported a 9-minute reduction. 


  • Rockette-Wagner, Bonny; Edelstein, Sharon et al (2015) The impact of lifestyle intervention on sedentary time in individuals at high risk of diabetes; Diabetologia published by the European Association for the Study of Diabetes, April 1, 2015; do:10.1007/s00125-015-3565-0

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