A very active person uses a large amount of energy and therefore has a high

Answer 1

metabolic rate. This means that their body is constantly burning calories to fuel their physical activity and maintain their body functions. They may have a higher baseline energy expenditure, also known as their Basal Metabolic Rate (BMR), which is the number of calories they burn at rest.

Additionally, their increased activity level can further increase their energy expenditure through exercise. Regular exercise can increase muscle mass, which in turn increases metabolism, as muscle requires more energy to maintain than fat. This is known as the Thermic Effect of Activity (TEA), which is the increase in energy expenditure as a result of physical activity.

In summary, a very active person has a high metabolic rate due to their increased energy expenditure both at rest (BMR) and during physical activity (TEA). This allows them to burn a larger amount of calories and maintain a higher level of energy output.