oo much sitting linked to heart disease, diabetes, premature death

http://www.health.harvard.edu/blog/much-sitting-linked-heart-disease-diabetes-premature-death-201501227618

Their findings were gleaned from 47 studies that looked at the health effects of sedentary behavior. The researchers adjusted for other types of activity people did, from leisure-time activities to vigorous exercise. Over the course of these studies, people who sat for prolonged periods of time had a higher risk of dying from all causes — even those who exercised regularly. The negative effects were even more pronounced in people who did little or no exercise.

http://www.mayoclinic.org/healthy-lifestyle/adult-health/expert-answers/sitting/faq-20058005

One study compared adults who spent less than two hours a day in front of the TV or other screen-based entertainment with those who logged more than four hours a day of recreational screen time. Those with greater screen time had:

A nearly 50 percent increased risk of death from any cause
About a 125 percent increased risk of events associated with cardiovascular disease, such as chest pain (angina) or heart attack

Sitting in front of the TV isn't the only concern. Any extended sitting — such as behind a desk at work or behind the wheel — can be harmful. What's more, spending a few hours a week at the gym or otherwise engaged in moderate or vigorous activity doesn't seem to significantly offset the risk.

The impact of movement — even leisurely movement — can be profound. For starters, you'll burn more calories. This might lead to weight loss and increased energy. Even better, the muscle activity needed for standing and other movement seems to trigger important processes related to the breakdown of fats and sugars within the body. When you sit, these processes stall — and your health risks increase. When you're standing or actively moving, you kick the processes back into action.