Couch potatoes beware: All those hours in front of the TV may be making you sick, or even killing you.

Watching television for two to three hours or more per day is linked to significantly higher risks of developing diabetes and heart disease and dying from all causes, according to a new analysis from the Harvard School of Public Health.

Noting that Americans watch an average of about five hours of TV per day — the most common daily activity aside from working and sleeping — researchers analyzed data from eight studies done between 1970 and 2011 on the association between TV viewing and incidence of type 2 diabetes, fatal or nonfatal cardiovascular disease and all-cause mortality.

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