Sedentary lifestyle: what it means and what it does to your body

• What it is: most waking hours spent sitting or leaning, at very low energy use [1].
• No safe number: WHO advises less sitting at every age but sets no safe number of hours [3].
• India's picture: in four Indian regions surveyed, more than half of adults were inactive, more so in cities [4].
• Exercise helps: in a pooled analysis, about 60 to 75 minutes of moderate activity a day seemed to offset the risk linked with long sitting [2].
• Breaks count: in one small trial, 2-minute walks every 20 minutes lowered the blood sugar rise after a test drink [5].

This is general information. If you have a heart, joint or blood sugar condition, or have not been active for a while, check with your doctor before starting a new activity routine.

Sedentary lifestyle meaning, in plain words

Think about yesterday. The chair at your desk from 9:30 to 6, the cab or metro home, then dinner and an hour of phone or OTT on the sofa. Add it up, and most of your waking day was spent sitting down.

A sedentary lifestyle is one where most of your waking time goes on sitting or leaning while your body uses very little energy: 1.5 METs or less [1].

A MET (metabolic equivalent) is a unit of energy use, where 1 MET is what you burn at rest; light activity runs from about 1.6 to 2.9 METs, moderate from 3 to 5.9 and vigorous from 6 up [1].

So computer work, TV, sitting in class or at the office and sitting through the commute all count as sedentary time [1]. Sleep does not, because the definition covers waking hours only. Or, as a colleague might put it over chai: din ka zyada time baith ke nikal gaya.

Here's the part many people miss. Physically inactive means you do not reach the weekly activity guideline, while sedentary is about how long you sit [6]. You can walk briskly every morning and still sit for ten hours after it, so one person can be active and sedentary on the same day.

Is your day sedentary? A quick check

Most of us guess low. Run through a normal workday and answer honestly:

• At work: you sit for most of your hours at the desk, meetings included.
• The commute: your trip to work and back is spent sitting in a car, cab, bus or metro.
• Evenings: TV, OTT or the phone fills most of the time between dinner and bed.
• Getting up: you often look up and find an hour or two has gone by without leaving the chair.
• Steps: on a normal day, you walk little beyond the canteen or the parking lot.

If most of these sound like your day, your day is mostly sedentary. That is true of many office and work-from-home jobs, and it is the setting the rest of this page is about. For more on desk life, food and movement, browse our everyday health guides.

There is no agreed safe number of sitting hours. WHO's 2020 guideline advises people of every age and ability to cut down on sitting, but says the evidence was not enough to set a threshold in hours [3].

You may already feel the day in your body: a stiff back by evening, a heavy feeling after lunch, a waistband that seems tighter. The next section is about what the research links with long sitting.

Sedentary lifestyle effects on your body

Long sitting is linked with problems across the body, from the heart and blood sugar to bones and mood.

The list of sedentary lifestyle diseases is long: higher all-cause mortality, heart disease, type 2 diabetes, high blood pressure, unhealthy blood fats, some cancers, joint pain, osteoporosis, depression and, less certainly, cognitive impairment [1]. The harm seems to grow as total daily sitting time grows [1].

Two words matter in all of this: linked with. These sedentary lifestyle risks are associations seen across large groups of people, which is not the same as proof that sitting alone causes each one.

Heart, blood pressure and cholesterol

When you sit for long, your body's demand for energy drops, and the heart pumps less blood around the body [1]. Long sitting is linked with higher blood pressure and with blood fat changes: higher triglycerides and lower HDL, the "good" cholesterol [1].

So the sofa hours after dinner belong in the same count as the desk hours.

Blood sugar and type 2 diabetes

Sitting still for hours slows the muscle enzymes and transporters that handle fat and glucose, so the metabolism of both slows down, and the body becomes less sensitive to insulin [1]. That is part of why long sitting is linked with type 2 diabetes.

If you have prediabetes or diabetes runs in your family, ask your doctor what kind of activity suits you.

Weight

Sitting is linked with obesity, and people carrying extra weight also tend to move less [1]. How the two are connected is still being worked out [1].

Bones, muscles and joints

Physical inactivity lowers bone mineral density, and long sitting is linked with osteoporosis and with joint problems such as knee pain [1].

Mood and sleep

Passive sitting, such as watching TV, is linked with a higher risk of depression, while sitting that keeps the mind busy, such as reading, showed no clear link [1]. Physical activity works the other way: in adults it eases symptoms of depression and anxiety and improves mental health and sleep [6].

What India's numbers show

If this sounds like a Western office problem, India's own data says otherwise. In the ICMR-INDIAB survey of 14,227 adults in Tamil Nadu, Maharashtra, Jharkhand and Chandigarh, published in 2014, 54.4% were inactive [4].

Inactivity was higher in cities than in villages, 65.0% against 50.0%, and men were more active than women [4]. Keep the scope in mind: these are four regions in the survey's first phase, and the fieldwork is more than a decade old, so it is not a figure for all of India today.

Worldwide, about 31% of adults, 1.8 billion people, do not get the minimum weekly activity [6]. What it means for you: a city desk job, with its long commute and screen-heavy evenings, is an easy place to slip into a sedentary lifestyle.

Does exercise cancel out sitting all day?

You did the 6 am walk, then sat for nine hours. The real question is whether the walk covers the chair.

In a pooled analysis of more than 1 million adults, about 60 to 75 minutes a day of moderate activity seemed to remove the higher risk of death linked with long sitting [2].

The same activity softened, but did not remove, the risk linked with heavy TV watching: among the most active, the risk stayed higher at 5 or more hours of TV a day [2].

There are catches. The data came from observational studies, mostly in high-income countries, so it shows a link, not proof [2]. And an hour or more of brisk activity every day is a lot to fit around a desk job.

The guideline baseline is smaller: 150 to 300 minutes of moderate activity a week, or 75 to 150 minutes of vigorous activity, plus muscle-strengthening work [3]. That works out to about 30 minutes of brisk walking on five days a week.

So the takeaway is two habits, not one: move more, and sit less. If you have a heart condition, ask your doctor how much activity suits you before you step it up.

Small breaks that help at work

If your sitting comes with a desk job, the workday is where most of it happens, so it is where small changes add up.

In one small lab trial in 19 overweight or obese adults aged 45 to 65, getting up for 2 minutes of light walking every 20 minutes lowered the rise in blood sugar and insulin after a test drink, compared with sitting still [5].

That is one short lab study, so it tells us nothing about months or years. It does suggest the breaks in the chair are worth trying, alongside the evening walk.

Ways to build walking breaks into a desk day:

• A reminder: set your phone or laptop to nudge you every 30 or 45 minutes, and stand up when it does.
• Calls on your feet: take phone calls standing or walking; a call with the camera off can be a walking call.
• Stairs to the canteen: take the stairs for a floor or two instead of the lift.
• Walk over: go to a colleague's desk instead of sending a message.
• The lunch walk: walk for 10 minutes after lunch, before you sit back down.
• A stretch for hips and back: stand, reach up and twist gently once an hour.
• A standing desk, if you have one: switch between sitting and standing through the day.

What goes in the tiffin matters on a desk day too, and our office lunch ideas are built for exactly this kind of day.

At home and on weekends

In a sedentary lifestyle, evenings are the second long sit of the day, and often the easier one to change, because nobody is watching the clock.

• Chores as movement: cooking, sweeping, folding clothes and watering the plants all get you off the sofa.
• The after-dinner walk: the old family habit of a walk round the block after dinner is worth bringing back.
• Screens with breaks: stand up between episodes, or every time the ads come on during a match.
• One active weekend plan: a morning walk in the park, a game of badminton or a market trip on foot.

Every bit of this counts, because some movement is better than none [6]. The weekly guideline from the exercise section is easier to reach in pieces like these.

The swaps in one place:

Desk-day swap	What it replaces
Taking calls standing	Taking calls in the chair
A walk after lunch	The phone after lunch
The stairs	The lift
Chai with fewer spoons of sugar	Chai with two spoons

The desk-day food habits that go with sitting

A sedentary lifestyle rarely comes alone. The office chai round arrives at 11 and again at 4, with biscuits on the side, and a birthday means a box of mithai going from desk to desk.

In our survey of our own buyers, 64% said their sweetener goes into chai and 66% into coffee [7]. For many desk days, then, the cup is the easiest place to start.

• Fewer spoons: cut one spoon of sugar per cup this week, and another next month.
• The 4 pm slot: a handful of roasted chana, a katori of cut fruit or a few nuts in place of the biscuits.
• Water by the desk: a bottle you can see, refilled at lunch, also gives you a reason to get up.
• Mithai days: take one piece, then walk the box to the next desk yourself.

At The Sweet Change, we make a monk fruit sweetener with no erythritol or other sugar alcohols, as drops and powder, with sachets coming. It keeps the office chai sweet while the sugar spoon stays in the dabba.

Sitting less, starting this week

A sedentary lifestyle builds up from ordinary hours: the desk, the commute, the sofa. You do not have to change all of them at once. Pick one break at work and one evening habit, and keep them for a month.

Cheat sheet

• Know your sitting: desk hours, the commute and evening screens all count as sedentary time.
• No safe hours: there is no agreed safe limit, so aim to sit less than you do now.
• Break it up: stand or walk for a couple of minutes every half hour or so at work.
• Add activity in pieces: lunch walks, the stairs and the after-dinner walk all count toward the weekly guideline.
• Fix the cup: cut a spoon of sugar from the office chai and swap the 4 pm biscuit for roasted chana.

Our sweetener mention on this page is our view as the makers of The Sweet Change Monk Fruit Drops and Powder. This page is not medical advice: if you have a health condition or take medicine, talk to your doctor before changing how you eat or how active you are.