NEAT (Non-Exercise Activity Thermogenesis)

NEAT is the energy expended on everything physical that isn't deliberate exercise, sleeping, or eating: walking around, standing, fidgeting, household chores, occupational movement. It is a component of total daily energy expenditure (see tdee) alongside resting metabolic rate, the thermic effect of food, and the energy cost of structured exercise.

Two facts make NEAT matter for tracking:

• It is large and highly variable between people and within a person day to day — it can vary by hundreds of calories depending on lifestyle and unconscious activity.
• It adapts downward in a calorie deficit. As you diet, the body often reduces spontaneous movement (less fidgeting, more sitting), shrinking NEAT and blunting fat loss even when structured exercise and intake are unchanged. This adaptive drop is a common hidden reason a deficit "stops working" (see kpis-fat-loss).

You can't measure NEAT directly, but the trackable proxy is steps / daily movement (see steps). The practical play during fat loss is to defend a daily step floor so NEAT doesn't quietly collapse, rather than trusting a device's calorie estimate. The cleanest validation, as always, is the bodyweight trend against intake (see caloric-balance).

• NEAT = all non-exercise movement energy (walking, standing, fidgeting, chores, work).
• One of four TDEE components (RMR, TEF, exercise, NEAT).
• Large and variable; can differ by hundreds of kcal/day between people.
• Drops in a deficit (less spontaneous movement) → stalled fat loss.
• Not directly measurable; track via steps and defend a daily step floor.

• steps — the practical NEAT proxy to monitor.
• tdee — NEAT is a TDEE component.
• caloric-balance — falling NEAT erodes the deficit.
• kpis-fat-loss — NEAT collapse is a hidden stall cause.
• neat — keeping NEAT high as a habit.