Many of you may be familiar with the concept of Body Mass Index (BMI), however, I occasionally receive questions about its utility and role in determining level of care. So...here are the basics about BMI...
A person’s BMI is calculated using a BMI formula, or with the use of a BMI calculator, such as this one (Click). Or, you can use this formula here:
| BMI = |
weight (in pounds) |
| ———————————— X 703 | |
| (height in inches)² |
The National Institutes of Health provides guidelines for a healthy BMI range as follows:
Below 18.5 = Underweight
18.5–24.9 = Normal
25.0–29.9 = Overweight
30.0 and Above = Obese
These BMI ranges apply to adults; the BMI measurement applies differently to children. With children, a BMI percentage for an individual child is compared to BMI measurements for childrenof the same age and gender. Generally, children with a BMI below the fifth percentile for age and gender are considered underweight. Click HERE for a reference to Children's Growth Charts.
Important Limitations of BMI:
BMI is a calculation based on weight and height and cannot provide any additional detail about body composition (e.g., percentage of body fat). BMI measurements do not distinguish between body fat mass and lean tissue mass, nor do they consider one’s frame size. Therefore, BMI calculations may be
over-inflated in an athletic or very fit person due to a higher percentage of muscle mass. Likewise, a BMI calculation may not be as accurate for an elderly person with reduced bone density and muscle mass. Other factors such as ethnicity, pregnancy, adult age, gender, physical activity, and bone structure can produce variations in a BMI measurement (Shepphird, 2009).
Source: Shepphird (2009). 100 Questions and Answers about Anorexia Nervosa. Sudbury, MA: Jones & Bartlett Publishers.
If you have a question or topic you would like to see addressed in this Blog, you can visit http://www.drshepp.com, or e-mail mail@drshepp.com, or you can send your question via Twitter to www.twitter.com/drshepp



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