Glossary
What is NEAT (non-exercise activity thermogenesis)?
Updated 2026-08-16By Chris RichardsAll terms
Definition
NEAT is the energy you spend on everything that is not sleeping, eating, or sports-like exercise — walking to the shop, typing, standing, fidgeting. It is the most variable part of daily burn, and the part activity multipliers compress into a single dropdown.
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Definition
James Levine defined non-exercise activity thermogenesis as energy expended for everything that is not sleeping, eating, or sports-like exercise. Occupations and fidgeting can separate two people of the same size by hundreds of calories a day — which is most of why “lightly active” and “moderately active” feel like a guess.
TDEE calculators hide NEAT inside the activity factor. They do not measure your steps. Choosing one tier too high inflates maintenance calories and quietly deletes a deficit.
Why NEAT falls in a deficit
When intake drops, spontaneous movement often drops with it: fewer steps, less fidgeting, more sitting. The gym session is still in the diary; the 2,000 unconscious steps are not. That is one reason a plan that worked in week one stalls by month three even when logging looks perfect.
The mistake people make
Adding a watch’s “calories burned” on top of an activity-adjusted TDEE. The multiplier already tried to price daily movement. Eating those extra calories back is how a deficit disappears. Hold a step target if you want a NEAT floor; do not stack two estimates of the same movement.
FAQ
Is walking NEAT or exercise?
A commute or a dog walk is NEAT. A planned training walk you would skip on a rest day is exercise. The label matters less than not counting the same steps twice.
Can I increase NEAT on purpose?
Yes, a bit: more walking, standing breaks, stairs. It will not replace a calorie target, but it defends against the quiet drop in movement that shows up in a long deficit.
Sources
- [1] Levine JA. “Non-exercise activity thermogenesis (NEAT)” (2002) — Best Practice & Research Clinical Endocrinology & Metabolism 16:679–702 (PMID 12468415)
- [2] Mifflin MD, St Jeor ST, et al. “A new predictive equation for resting energy expenditure in healthy individuals” (1990) — American Journal of Clinical Nutrition 51:241–247
General nutrition information, not medical advice. Calorie and macro targets are estimates — talk to a doctor or a registered dietitian before changing your diet, especially if you are pregnant, managing a health condition, or have a history of disordered eating.
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