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Three: How much can one person's metabolism differ from another's?

If age, gender, height and body composition are the same, the variation in resting metabolism is likely to be less than 3 percent, according to Steve Smith, M.D., an Assistant Professor of Endocrinology at the Pennington Biomedical Research Center of Louisiana State University. For example, if two equally active 38-year-old women are both 5'5" and weigh 130 pounds, one might have a daily RMR of 1,800 calories and the other, 1,854 calories—an increase that only buys the second woman about two walnuts per day.
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