Too much TV time may hurt your heart - CNN.com: "The study doesn't prove that watching TV or playing computer games is inherently unhealthy, says the lead researcher, Emmanuel Stamatakis, Ph.D., an epidemiologist at University College London, in the U.K. The real culprit may be what people tend to do during those activities: sit.
Why is sitting harmful? It's not entirely clear, but animal studies have shown that prolonged sitting slows down the action of an enzyme (lipoprotein lipase) that breaks down fats in the blood, such as cholesterol and triglycerides. When the enzyme activity slows, levels of those substances climb. This is a 'very plausible explanation' for the findings, Stamatakis says."
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