Metabolic rate refers to the speed at which the body converts food into energy. It is influenced by various factors, including age, gender, body composition, and activity level. A higher metabolic rate means the body burns calories more quickly, while a lower rate indicates slower energy expenditure. There are two main types of metabolic rates: basal metabolic rate (BMR), which measures energy used at rest, and total daily energy expenditure (TDEE), which accounts for all activities throughout the day. Understanding metabolic rate can help individuals manage weight and improve overall health.