I'm curious why even with weight loss (-17pounds) my scale BMI doesn't really ever change?

Know body compositio. It is important not to confuse bmi with body fat. The bmi (body mass index) numbers are not percentages of body fat. If bmi is same but fat is decreasing. There are quite a few groups of people for whom bmi is not as accurate –- short women and muscular people, to name two. Bmi also varies according to some ethnic groups. Knowing body fat percentage is an improvement over bmi.
The scale is wrong. Body mass index (bmi) is a number that takes into account both a person's weight and height. If a person stays the same height, changes in weight will always change the bmi. For example, a 5ft 6in person at 160 lbs has a BMI of 26 (overweight). If he drops to 150 lbs, he has a BMI of 24 (healthy). A BMI scale that doesn't change the BMI when the weight drops is not working properly.

Related Questions

I'm curious why even with weight loss (-17pounds) my scale BMI doesn't really ever change?

Should change. The BMI is a factor of your weight and you height, when you loose weight your BMI should change, however you may remain in the same category such as : overweight, obese, or healthy weight, if you dont loose enough weight to go from one category to the next. The categories are as follow : bmi: 18.5-25 = healthy weight, 25-30= overweight ; 35-40=obese; 40-70= very obese; 18.5-10=underweight. Read more...
Need more info. Study findings appearing in the may 2010 issue of "obstetrics and gynecology" suggest that racial- and ethnic-specific bmi cutoff values are needed as current cutoffs fail to identify many whites and hispanics as overweight. Other diagnostic measures such as waist circumference and blood pressure should be used in combination with bmi to accurately determine health risk. Consult your physician. Read more...