[Via – NY Times]

Your chair is your enemy.

It doesn’t matter if you go running every morning, or you’re a regular at the gym. If you spend most of the rest of the day sitting — in your car, your office chair, on your sofa at home — you are putting yourself at increased risk of obesity, diabetes, heart disease, a variety of cancers and an early death. In other words, irrespective of whether you exercise vigorously, sitting for long periods is bad for you.

That, at least, is the conclusion of several recent studies. Indeed, if you consider only healthy people who exercise regularly, those who sit the most during the rest of the day have larger waists and worse profiles of blood pressure and blood sugar than those who sit less. Among people who sit in front of the television for more than three hours each day, those who exercise are as fat as those who don’t: sitting a lot appears to offset some of the benefits of jogging a lot.

So what’s wrong with sitting?

The answer seems to have two parts. The first is that sitting is one of the most passive things you can do. You burn more energy by chewing gum or fidgeting than you do sitting still in a chair. Compared to sitting, standing in one place is hard work. To stand, you have to tense your leg muscles, and engage the muscles of your back and shoulders; while standing, you often shift from leg to leg. All of this burns energy.

For many people, weight gain is a matter of slow creep — two pounds this year, three pounds next year. You can gain this much if, each day, you eat just 30 calories more than you burn. Thirty calories is hardly anything — it’s a couple of mouthfuls of banana, or a few potato chips. Thus, a little more time on your feet today and tomorrow can easily make the difference between remaining lean and getting fat.

You may think you have no choice about how much you sit. But this isn’t true. Suppose you sleep for eight hours each day, and exercise for one. That still leaves 15 hours of activities. Even if you exercise, most of the energy you burn will be burnt during these 15 hours, so weight gain is often the cumulative effect of a series of small decisions: Do you take the stairs or the elevator? Do you e-mail your colleague down the hall, or get up and go and see her? When you get home, do you potter about in the garden or sit in front of the television? Do you walk to the corner store, or drive?

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