A good metabolic rate balances the intake of diet by an individual with his total daily energy expenditure. The TDEE, or maintenance level, represents normal daily activities and physical exercise. The maintenance level and basal metabolic rate helps an individual to adjust his diet, and balance his daily physical activity.
According to exercise physiologists William Mc Ardle and Frank Katch, the average maintenance levels of women and men in the United States are 2000-2100 and 2700-2900 calories per day, respectively. The maintenance levels of Athletes, or highly active individuals, differ widely from the average values.
Basal metabolic rate determines the amount of energy needed by the body to carry out basic functions for the survival. There are other factors like age, genetics, gender, eating habits and muscle to fat ratio that can influence the metabolic rate.