A NYT Opinionator reminding us how the gradual drag of modern-day-life makes us fat and die. “Stand Up While You Read This”

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?