A 50-year-old man’s basal metabolic rate is usually calculated by subtracting 111 from the sum of his pulse rate and pulse pressure, which is normal within the range of plus or minus 10% or 15%, and there is no such thing as the “optimal basal metabolic rate”. There is no such thing as “optimal basal metabolic rate”. Basal metabolic rate is the energy metabolism rate measured when a person is awake, not active in the morning, not under stress, in a favorable environment and temperature, and without meals. The basal metabolic rate decreases with age. However, men tend to have a higher basal metabolic rate than women. Normally, the basal metabolic rate is calculated as the sum of the number of pulse beats plus pulse pressure minus 111. In clinical hyperthyroidism, the basal metabolic rate is significantly increased. In hypothyroidism, the basal metabolic rate tends to decrease, but this should only be used as a preliminary assessment. Abnormalities in the basal metabolic rate are recommended for consultation in the endocrinology department of the regular hospital.