Sitting too much is wrecking our health. You fight physical inactivity the obvious way — with physical activity.
Scott Lear, a professor of medical sciences at Simon Fraser University (Canada), studied the dangers of a . He says regular exercise can:
- improve mental health
- reduce disease risk
- lengthen lifespan
The World Health Organization (WHO) recommends that adults get at least 150 minutes per week of moderate‑intensity physical activity (brisk walking, easy cycling) or at least 75 minutes per week of vigorous‑intensity activity (running, tennis). Yet worldwide, only 73 percent of adults meet these recommendations.
Why experts are sounding the alarm about physical inactivity
The WHO calls physical inactivity the fourth‑highest modifiable — a risk you can lower by changing your lifestyle. WHO experts estimate that a 10 percent increase in physical activity could prevent 500 million premature deaths.
Professor Lear notes that people are sitting more in everyday life, largely because many workers now do their jobs from home.
Some researchers estimate that modern adults sit about six hours a day on average. But recent accelerometer studies show average daily sitting time is approaching 10 hours.
What sitting too much does to your body
From a biological standpoint, sedentarism isn’t just the opposite of activity — it triggers real physiological changes that threaten health.
Here are the main changes to watch for:
- Slowed metabolism: In a sedentary person, energy needs drop significantly.
- Fat (triglyceride) buildup in the blood: Because the body needs less energy while sitting or lying down, it reduces production of some important enzymes. For example, lipoprotein lipase (LPL) breaks down fats in the blood and helps muscles and organs use fat as a fuel source.
- Muscle weakening: Muscles need movement to stay strong.
- Varicose veins and deep vein thrombosis: These conditions result from blood pooling in the lower limbs. Over time, such changes raise the risk of dementia, cancer, cardiovascular disease, and premature death.
In a new study, Professor Lear’s team found that more sitting time was linked to premature death regardless of a person’s . The risk was higher for study participants who lived less active lives, according to The Conversation.
“Can physical activity offset sitting? Short answer: yes — being physically active, even when you sit for long stretches, is better for your health than being inactive. But it depends on how active you are and how long you sit,” Professor Scott Lear says.
Interestingly, among participants who followed WHO physical‑activity recommendations, sitting more than six hours a day carried the same risk as sitting less but not meeting those recommendations.
How to manage sedentary time
We shouldn’t stop sitting altogether — and we don’t need to, Professor Lear says. Sitting is important for rest and recovery, and many tasks are best done while seated.
The main goal is to reduce total sitting time. The question is how.
Standing is one proposed solution. Standing‑desk production has boomed in recent years. But prolonged standing affects metabolism much like sitting does.
Other health problems tied to long periods of standing include:
- muscle fatigue
- varicose veins
- increased risk of cardiovascular disease
The best solution is to replace sitting or standing with movement. “Our study showed that replacing 30 minutes of sitting with movement reduces the risk of premature death by two percent in people who sat for more than four hours a day,” Professor Lear says.
Standing up and isn’t possible in every situation (for example, during certain work tasks). But you can interrupt sitting periodically and move.
To keep your metabolism active and help control insulin and glucose levels, alternate sitting every 20–30 minutes with two minutes of physical activity (light walking, marching in place, squats, etc.).
Also remember that you can take phone calls while pacing the office, and some meetings can be held while walking.
Photo: Unsplash
