International Sports Sciences Association (ISSA) Trainer Practice Exam

When caloric intake is lower than the amount needed to maintain normal function, RMR increases. Is this true or false?

1. True

2. False

3. Only for athletes

4. Only in extreme conditions

The correct answer is: False

The assertion that when caloric intake is lower than what is needed to maintain normal function, resting metabolic rate (RMR) increases is false. In fact, when caloric intake decreases significantly, the body often responds by lowering its metabolic rate in an effort to conserve energy. This is a physiological adaptation that occurs during conditions of caloric restriction or starvation—commonly referred to as metabolic adaptation. When the body senses that it is not receiving enough energy (calories) to support its normal functions, it reduces RMR to decrease energy expenditure and preserve essential bodily functions. This is particularly important in prolonged periods of caloric deficit, where the body shifts to a state that emphasizes survival over sustained energy expenditure. While athletes may experience varying effects on metabolism due to their increased muscle mass and training adaptations, the general principle applies to all individuals: an insufficient caloric intake typically leads to a decrease in metabolic rate, not an increase.