Energy expenditure (TDEE) refers to the number of calories you burn (use) each day. These calories can be used through your basal metabolic rate (BMR) or exercise.
Your body naturally burns a number of calories every day without exercise to carry out a number of biological and metabolic processes. Whether you are chewing, thinking, or fidgeting, or whenever the body needs to secret hormones and digestive enzymes, all these processes require an amount of energy. This refers to the resting metabolic rate/ basal metabolic rate (BMR).
On the other hand, calories are also burnt during exercise. You will burn a number of calories whenever you make a physical step, pick up a dumbbell or perform any movement.
To summarise, energy expenditure refers to the burning or using of consumed calories to fuel your daily biological processes and physical activity that are performed every day.
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