What is the definition of energy balance?

Energy balance is defined as the state in which the total amount of energy consumed through food and beverages matches the total amount of energy expended through metabolic processes and physical activity. When energy consumed equals energy expended, the body maintains its weight, as there is no surplus or deficit of energy. This balance is crucial for various physiological functions and overall health.

In contrast, when energy consumed is greater than energy expended, the body stores the excess energy as fat, which can lead to weight gain over time. Similarly, if energy expended is greater than energy consumed, the body begins to use stored energy, potentially leading to weight loss. The concept of energy lost equaling energy gained is not accurate in the context of energy balance definitions, as it does not reflect the comparison needed for balance. Thus, the first choice clearly establishes the fundamental principles of energy balance.