Which of the following correctly defines TDEE?

The correct definition of TDEE is Total Daily Energy Expenditure. This term encompasses the total amount of energy that a person expends in a day, including all activities such as exercise, work, and daily living tasks, as well as the energy used for basic bodily functions at rest (known as resting metabolic rate) and the thermic effect of food. Understanding TDEE is crucial for designing effective nutrition and exercise plans, as it helps individuals determine how many calories they need to maintain, lose, or gain weight.

The other options, while related to energy balance, do not accurately reflect the comprehensive nature of TDEE. Total daily energy input would refer to the total calories consumed, but it does not account for energy expenditure. Total overall energy is vague and lacks specificity in the context of daily energy use. Lastly, total energy during exercise only accounts for the calories burned during physical activity and does not encompass the full spectrum of daily activities and metabolic processes that contribute to TDEE.