Our expert says:
The human body does many things (digests food, breathes, circulates blood, maintain body temperature, etc). All these hundreds of processes together are called metabolism. The body also needs lots of energy to do all these things and the amount of energy used to keep the body processes going, are called the Basic Metabolic Rate. Up to 75% of a person's daily energy requirement is used to keep these processes going, thus if you are an adult woman who requires 8400 kJ per day, then up to 6300 kJ are used by your body's metabolism. Many factors influence the Basic Metabolic Rate (BMR): a) Age - older people have a slower and lower BMR than young people; b) Gender - men have a much higher BMR than women; c) Body build - ectomorphs with a high percentage of muscle tissue have a much higher BMR than someone with little muscle tissue d) Hormones - a variety of hormones increase or decrease the BMR - for example thyroid hormone and testosterone increases the BMR. So people who have a slow metabolism may be older, female, have little muscle tissue and have thyroid deficiencies. A young man with lots of muscle tissue will of course have a fast metabolism. The best way to stimulate a sluggish metabolism is to do 30 or more minutes of active exercise every day.
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