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" &amp;quot;How do you know if your weight is more than it should be due to muscle mass?&amp;quot; Katie, 14, Boston, MA The most commonly used measurement is body mass index (BMI), which is a calculation that estimates how much body fat a person has based on his or her weight and height. It&amp;#039;s true that muscle does tend to weigh more than fat, but if your BMI falls somewhere between the 5th and 85th percentile, you&amp;#039;re likely to be at a healthy weight. If your BMI is equal to or greater than the 85th percentile, you may be overweight. However, BMI is only an estimate and not a direct measure of body fat, so it is possible for a muscular teen to have a BMI &amp;amp;gt;85th percentile but not have excess body fat.   If you&amp;#039;re concerned about your weight, talk to your doctor, who can determine if your weight is due to muscle or fat. For the most part, though, you&amp;#039;re on the right track if you are eating a balanced diet, limiting high-calorie foods, watching portion sizes, and getting regular exercise (at least 60 minutes on most days). "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.seventeen.com/health/fitness/q-and-a/a1847/muscle-fqa-042408/>