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Non-exercise activity thermogenesis (NEAT), also known as non-exercise physical activity (NEPA),[1] is energy expenditure during activities that are not part of a structured exercise program. NEAT includes physical activity at the workplace, hobbies, standing instead of sitting, walking around, climbing stairs, doing chores, and fidgeting.[2][3] Besides differences in body composition, it represents most of the variation in energy expenditure across individuals and populations, accounting from 6-10 percent to as much as 50 percent of energy expenditure in highly active individuals.[4]
NEAT is the main component of activity-related energy expenditure in obese individuals, as most do not do any physical exercise. NEAT, also known as nonresting energy expenditure, is also lower in obese individuals than the general population.[4]
NEAT may be reduced in individuals who have lost weight, which some hypothesize contributes to difficulties in achieving and sustaining weight loss.[1]
In Western countries, occupations have shifted from physical labor to sedentary work, which results in a loss of energy expenditure. Strenuous physical labor can require 1500 calories or more per day than desk work.[3]
