Want to Learn Some New Things About Your BMI, or Body Mass Index?
photo by howstuffworks.com
Body Mass Index (BMI): What, exactly is it?
Well, you’re about to learn a WHOLE lot more than you previously knew to be true!
Body Mass Index (BMI) is a number calculated from a person’s weight and height. It has been thought that BMI provides a reliable indicator of body fat for most people and has been used to screen for weight categories that may lead to health problems. BMIwas introduced by a Belgian statistician in 1835, the BMI formula is: weight /height2. Its popularity comes from the fact it is easy to measure everyone’s weight and height.
Here is a great YouTube video from scoobysworkshop.com that details how to calculate BMI on your own:
You can take your weight divided by your height squared, or you can just look at a BMI chart and find your weight and height and where they intersect on the chart is your body mass index (BMI). The charts breakdown the categories of underweight, normal, overweight and obese and each category has subcategories such as class 1, 2, 3 which indicate higher percentages of fat.
photo by healthyweightforum.org
BMI is a handy tool, but it is not right for everyone. It may not accurately assess health risks in certain adults, who are:
- muscular athletes
- people under age 18 who have not reached full growth
- pregnant or lactating women
- adults over 65 years of age
photo by nytimes.com
In general, it has been the measurement used to predict possible current and future health issues, such as diabetes. A report on BMI from the Journal of the American Medical Association (JAMA) was released last week and has stirred up quite a controversy.
A study done by Dr. Katherine Flegal and her team indicates that when people in the normal weight categories were compared to those in the overweight category, the overweight people had a lower risk of dying of any cause, and those in the obese category had an elevated risk. It should be noted that more than half of those in the obese category were in class 1, and these individuals had no increased risk of dying compared to normal weight individuals. Class 2 and 3 individuals did have an elevated risk of death.
The conclusion of this analysis comparing BMI with risk of dying found that being overweight actually appeared beneficial and that the negative effects of being obese only seem to matter for those who are very obese.
The creators of the study did acknowledge that there were some limitations in their study but they only used one sentence to discuss the limitations of BMI. It is also important to note that the paper didn’t mention the effects of physical activity, diet, or socio-economic status.
Needless to say, the study has drawn a great deal of attention from the general public and many negative comments from the medical community.
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