A study published in the American Heart Association journal Circulation suggests that watching TV - or sitting in front of a PC for that matter - can increase the risk of a heart attack or stroke by a staggering 80 percent.
The survey assessed 7,000 Australian people based on the amount they watched TV and continued monitoring the people for six years.
The findings showed that every hour spent being a couch potato increased the risk of cardiovascular ailments by 18 percent.
The figures are irrespective of other elements that tend to cause heart disease, including obesity and smoking.
And it's not just your heart that might suffer. According to the survey every hour spent sitting in front of a TV increases the risk of cancer by nine percent.
The news will not be regarded with much favor by manufacturers of LCD TVs or 3D TVs, we suspect.