It's not uncommon for most of us to use a scale to measure our progress when we embark on a weight loss mission, but what does the common scale really tell us? After all, a scale can't tell the difference between a pound of muscle and a pound of fat.
Recently the utility of measuring only body weight has come under well-deserved scrutiny in the scientific and medical communities. The use of comparing weight to height squared (BMI) can be misleading when it is used to predict obesity-related conditions or measure progress during a weight management program because it does not distinguish excess fat from lean tissue. The best example is an individual who develops lean muscle mass while losing body fat but has a higher-than-normal BMI.
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Scale weight alone does not predict your health risk. Evidence shows that 50% of "normal weight" individuals with higher body fat percentages have the same cardiovascular risk as their "overweight" peers. Mayo Clinic Women's Health Source. Normal Weight Obesity: A Real Health Rick. Tuesday, September 2, 2008