A Answers (3)
Mehmet Oz, MD, Cardiology, answeredMany factors determine how fast or slow one metabolizes food. Dr. Oz reveals the contributors to metabolism speed in this video.
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Sari Greaves, Nutrition & Dietetics, answeredOne factor why the metabolism slows down after 40 is the loss of muscle mass with age. Muscle is more metabolically active than fat tissue, so when you have more lean body mass, you burn more calories. In women, estrogen levels drop after menopause, which causes thyroid hormones that regulate metabolism to go down too.
Your basal metabolic rate, how many calories you burn for physiological processes, slows down with age and the loss of lean muscle mass that happens with getting older. The decrease may be 2-3% with each decade.
You can help stop some of this slow down by staying active and including strength training in your daily exercise plan to maintain muscle. Eating enough protein is also important to keep muscle on board as you get older. Choose lean proteins such as eggs, lean meats. low fat dairy, beans, and legumes daily.