The term metabolic rate refers to the rate at which the body expends energy, or calories, to maintain basic physiological functions at rest, known as the Basal Metabolic Rate (BMR), as well as during physical activity. Factors influencing metabolic rate include age, gender, body composition, and activity level. A higher metabolic rate can facilitate weight management and energy balance, while a lower rate may make it challenging to lose weight. Understanding one's metabolic rate can help in tailoring dietary and exercise plans for optimal health outcomes.