The science of weight loss involves understanding how the body uses energy (calories) from food and how physical activity affects energy expenditure. To lose weight, a person must create a calorie deficit by consuming fewer calories or burning more calories through physical activity, or a combination of both.
The body burns calories through several processes such as:
Basal metabolic rate (BMR): the number of calories the body burns at rest to maintain basic functions such as breathing and circulation
Thermic effect of food (TEF): the number of calories burned during the digestion and absorption of food
Physical activity: the number of calories burned during exercise and other forms of physical activity
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