Which of the following statements is true about BMR?

The statement that a higher BMR indicates higher energy expenditure is correct because Basal Metabolic Rate (BMR) represents the number of calories your body needs to maintain basic physiological functions while at rest, such as breathing, circulation, and cell production. Therefore, when someone has a higher BMR, it signifies that their body requires more energy to perform these fundamental activities. This often correlates with other aspects of metabolism and physical state, where individuals with higher muscle mass or overall body size tend to have an increased BMR, resulting in a higher overall energy expenditure throughout the day.

Contextualizing the other statements helps clarify the correct choice. BMR typically decreases with age due to factors such as hormonal changes, loss of muscle mass, and decreased physical activity, which contradicts statements suggesting it increases or is higher in older individuals. Additionally, BMR does fluctuate slightly throughout the day based on factors like diet, activity level, and sleep, making the claim that it does not fluctuate inaccurate.