Body Mass Index (BMI)
_______ (BMI) is a tool for assessing an individual’s weight status. This index is calculated by dividing a person’s weight in pounds by height in inches squared. This number is then multiplied by a factor of 703 (Figure 7.26).
_______ is calculated in the same way for _______ , _______ , and _______ . The resulting number, however, receives different interpretation for different age groups. Because children and teens are still growing, their BMI values are plotted on growth charts based on _______ . The BMI percentile for children and teens indicates the relative position of the person’s BMI compared with others of the same sex and age. (See the Appendix in the back of this book to view the BMI charts for boys and girls.)
For children and teens, the Centers for Disease Control and Prevention (_______ ) defines _______ as having, for a particular height, excess body weight from _______ , _______ , _______ , _______ , or a combination of these factors. The CDC defines obesity as having excess body fat or excessive overweight. According to the CDC, children and teens who are affected by _______ have a body weight that is too low compared with others of the same sex and age. For adults, these weight categories are based on specific BMI values.
BMI calculation is an easy method for assessing weight status, but it is not perfect. For some individuals, BMI is not accurate due to differences in body composition. Because muscle and bone weigh more than fat, people who are highly fit or muscular may have a high BMI, which incorrectly places them in the overweight category. Likewise, an individual may have a body weight in the acceptable range, but a high percentage of body fat to muscle. BMI would inaccurately place this person in the healthy range.