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For most Americans, the largest percentage of their total calories expended daily is from:
-physical activity
-thermal effect of food
-basal energy expenditure
-sitting
Basal energy expenditure accounts for 60-70% of daily total calories expended.
Physical activity accounts for 20% in sedentary adult and up to 50% in people who are very active.
Thermal effect of food is estimated to be about 10% of daily caloric intake.