Daily Energy Expenditure Components
The total energy expended by the body over a 24-hour period is known as daily energy expenditure. It is primarily composed of three main components:
- Basal Metabolic Rate (BMR): The energy required to maintain vital bodily functions at complete rest (e.g., breathing, circulation, cell production).
- Thermic Effect of Food (TEF): The energy used for digesting, absorbing, and metabolizing food.
- Activity Thermogenesis: Energy expended during physical activity. This includes both planned Exercise (EAT) and unplanned Non-Exercise Activity (NEAT) like fidgeting, posture maintenance, etc.
BMR's Dominant Role in Energy Expenditure
Among these components, the Basal Metabolic Rate (BMR) consistently represents the largest share of total daily energy expenditure. In most individuals, BMR accounts for approximately 60% to 75% of their total daily calorie needs.
The energy used for physical activity (exercise and non-exercise) and the thermic effect of food, while important, contribute significantly less compared to the continuous energy demands of basic physiological functions.
Identifying the Major Contributor
Given that BMR constitutes the largest percentage (typically 2/3rds or more) of the 24-hour energy expenditure, it is the major contribution.
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- Kalpsutra, the illustrated canonical text is from:-
- The Harappan city almost exclusively devoted to craft production was-:
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