Notes
Non-Exercise Activity Thermogenesis (NEAT)
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Non-exercise activity thermogenesis, or NEAT, is the energy you burn doing everything that is neither sleep, meals, nor deliberate exercise: walking to the printer, taking the stairs, cooking, fidgeting, and simply holding yourself upright. Named and mapped by the Mayo Clinic physiologist James Levine, it is the most variable component of human energy expenditure — and the one most quietly reshaped by a desk job.
The most variable number in metabolism
Between two adults of the same size, age, and sex, NEAT can differ by as much as 2,000 calories a day. Most of that gap is occupational and postural: a chair-bound worker may spend only a few hundred calories on movement, a job spent mostly on the feet roughly double that, and physical labor more than a thousand calories beyond either. It is the part of the metabolic budget that a sedentary environment silently confiscates.
The overfeeding experiment
Levine's 1999 study in Science remains the clearest demonstration. Sixteen volunteers were overfed a thousand surplus calories a day for eight weeks. Who stored the surplus as fat and who shrugged it off was predicted not by exercise or by basal metabolism but by NEAT: those whose bodies ramped up incidental movement gained the least, and the variation in NEAT explained a roughly ten-fold spread in fat gain. The body's first, involuntary defense against weight gain is to move more.
A small lever and a larger one
This is also why standing desks are oversold as weight-loss tools. Measured directly, standing burns only about 0.15 calories per minute more than sitting — perhaps fifty extra calories across a long workday, easily erased by a slightly larger lunch. The lesson of NEAT is not that one posture is magic but that incidental movement compounds: frequent, low-intensity activity spread through the day moves far more energy than any single change of furniture.
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- 2026-06-28