The basal metabolism of an adult male is usually around 1400-1500kcal. Basal metabolism is the minimum energy requirement for all organs of the body to sustain life and is usually expressed as the basal metabolic rate, which is not affected by the environment, temperature, muscle activity, etc., but is affected by factors such as height, weight, age and sex. Usually men have a higher basal metabolic rate than women, and older basal metabolic rates are lower than younger basal metabolic rates. The basal metabolism of adult males is around 1400-1500kcal. The common formula for basal metabolic rate is (pulse rate + pulse pressure) – 111, which is normal if it does not exceed or fall below 15% of the normal value. The basal metabolic rate is a major aid in the clinical diagnosis of thyroid disorders. It may be significantly higher in hyperthyroidism and lower in hypothyroidism. It is recommended to consult a doctor if the basal metabolic rate is abnormal.