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Waist and Hip Measurements
One indirect measure that is used is the Body Mass Index. This calculation is widely used in research and has proven a fairly accurate predictor of risk for illness. Another measurement is the Waist to Hip Ratio or WHR. This is calculated by dividing the measurement around your waist by the measurement around your hips.
What does Waist to Hip ratio have to do with Body Mass Index?
As a physician I look to have an idea of how my patient's health might be overall. I am looking for certain risk factors for disease and the research has come to show that being overweight or obese can be an issue. In looking at my patient's weight I want to have a guide of what a healthy weight is but we now also know that the distribution of the weight on the body is an important factor.
BMI, WHR, and your risk of diabetes
I've written previously about Body Mass Index and Waist to Hip ratio and their usefulness in assessing your overall health. There's been some controversy in medical circles, however, about whether Body Mass Index (BMI), Waist to Hip Ratio (WHR) or simple Waist Circumference (WC) is a better predictor of type 2 diabetes.
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One of the measurements that is used in most research regarding common health problems is the Body Mass Index. BMI works as a good guide for us because it is an inexpensive way to evaluate body fat. It is not perfect, however, and use of Waist to Hip Ratio (WHR) is being studied more and more as another measure to help guide both research and therapy in medicine today.
One area in question is the use of BMI in those over 75 years old. There has been the observation that the measurement doesn't appear to correlate as well with disease as with the predictive value it offers in younger people. Gill M. Price and his colleagues in England evaluated whether WHR might be a better way to evaluate the elderly. Dr. Price's reports on data collected from almost 15,000 participants of a study in the U.K. (AJCN 2006;84(2):449-460).
Height, weight, hip and waist measurements, as well as a wide range of lifestyle, physical and social information, was collected as part of a large multi-center effort beginning in the early 1990s and extending into 2003. The researchers found that those over 75 with higher BMI were not necessarily at higher risk for dying from cardiovascular problems or many other health issues.
Interestingly, a higher WHR was positively associated with such health issues as well as death from circulatory illness (heart attack and stroke). This was not true when the researchers looked at the measurement of the waist by itself, however.
While it is a good and inexpensive assessment of body fat there are limitations to using BMI. Measuring the WHR helps to define what is known as "central adiposity" or fat around one's middle (that "spare tire" many develop in middle age). The elderly often lose muscle mass before losing the spare tire and the result can be a skewed BMI. Likewise, any loss of height as people age (which is common) will alter the BMI equation as well.
In my practice I use both BMI and WHR to evaluate patient's potential problems with weight at every age. Neither is a perfect measurement and as with all such tests must be taken in context of the individual.
First posted: August 16, 2006