PREVIEW
Calories are the units of energy you get from foods and beverages, and when you consume fewer calories than you burn, you achieve a calorie deficit.
The calories you burn or expend each day - also known as calorie expenditure - include the following three components (1Trusted Source):
Resting energy expenditure (REE). REE refers to the calories your body uses at rest for functions that keep you alive, such as breathing and...