Non-Exercise Activity Thermogenesis (NEAT)
The energy expended for all spontaneous physical motion that is not structured athletic exercise or sleep.
Clinical & Bioenergetic Overview
Non-Exercise Activity Thermogenesis (NEAT) accounts for the caloric cost of daily biological movement outside of scheduled workouts. This includes standing, pacing during phone calls, cleaning, typing, walking from the car, and unconscious subconscious movements like fidgeting and maintaining upright posture. In free-living humans, NEAT can vary by up to 2,000 kcal/day between sedentary and highly active individuals of identical body size.
Mathematical Formula & Calculation
Real-World Worked Example
Two desk workers both weight 190 lbs with identical BMR (1,850 kcal). Person A sits 10 hours a day and drives everywhere (NEAT = 300 kcal). Person B uses a standing desk, takes stairs, and averages 12,000 daily steps (NEAT = 950 kcal). Person B burns an additional 650 kcal daily without any gym training.
Why It Matters for Dieting
NEAT is the primary metabolic parameter that drops during a prolonged caloric deficit. When dieting, the central nervous system down-regulates spontaneous movement to conserve fat stores.
Frequent Mistakes
Assuming 45 minutes of weightlifting makes someone an "active" person if they remain motionless for the remaining 23 hours of the day.
Adjust Activity Multiplier
See how daily steps and occupational activity impact your daily energy output.
Related Bioenergetic Terms
The total cumulative number of kilocalories your body burns over a 24-hour cycle across all metabolic components.
The physiological decline in resting and non-resting energy expenditure beyond what is predicted by the loss of body mass.
The rate of energy turnover through a biological system, measured by the volume of calories consumed versus expended.