What occurs when energy intake equals energy expenditure in terms of body weight?

When energy intake equals energy expenditure, the body achieves a state of energy balance, which is essential for maintaining stable body weight over time. In this state, the calories consumed through food and beverages match the calories burned through daily activities and physiological processes, such as metabolism and exercise. As a result, there is no surplus energy to be stored as fat, nor is there a deficit that would lead to weight loss. This balance helps in maintaining what is often referred to as a "set point" for body weight.

Maintaining balanced weight does not contribute to gains in muscle mass—the body will only build additional muscle if there is a sufficient caloric surplus combined with appropriate resistance training. Similarly, weight loss or weight gain would occur only if there were a consistent calorie deficit or surplus, respectively. Hence, the concept of energy balance is fundamental in understanding weight management and the various factors that influence body weight stability.