Analyzing lifestyle data from over 11,000 people, researchers at the University of Queensland, Brisbane, found that each hour of television watched reduces life expectancy for Australians by about 22 minutes. Television viewing was particularly associated with cardiovascular disease. Results are expected to be similar for other countries with similar lifestyle habits.
The strong link between television and early death is believed to be due to the generally poor lifestyle habits of chronic television viewers, including lack of exercise and poor eating habits.
You can find a summary of the study on television viewing and life expectancy on the British Journal of Sports Medicine web site.
Relevance to Natural Weight Loss: 
Weight Loss Tip: Pull yourself away from the TV and do something physical, or, if you want to watch television without paying for it with bits of your life, do it snack-free and while riding an exercise bike.
Natural Weight Loss Tips 