5.10.2011

Why I hate the BMI index

I have struggled with my weight for YEARS. I have never been "thin" and I pack away a lot of muscle. I also have packed on fat within the past ten years as well. Life changes, habit changes, and most of all, diet changes are to blame. I however loathe the American BMI index. I loathe it with a passion. I am short and stocky but as said, I am not without muscle.

So using the BMI calculator:
64" @ 190, I have a BMI index of 32.6 which is the obesity range. Ok, fine. I was considered "obese" when I was in high school.

But using the long hand calculations, measurements, and taking the time to work this all out... I get a very different answer. I'll break it down step by step.

Body Fat Formula For Women

Step 1: Multiply total body weight x 0.732, then add 8.987 = Result 1
Step 2: Divide wrist measurement (at fullest point) by 3.140 = Result 2
Step 3: Multiply waist measurement (at naval) x 0.157 = Result 3
Step 4: Multiply hip measurement (at fullest point) x 0.249 = Result 4
Step 5: Multiply forearm measurement (at fullest point) x 0.434 = Result 5
Step 6: Add Step 1 + 2, subtract Step 3, subtract Step 4 and add Step 5 = Lean Body Mass
Step 7: Subtract lean body mass from total body weight = Body Fat Weight
Step 8: Multiply body fat weight x 100, then divide it by total body weight = Body Fat Percentage.


1. 190 x 0.732 + 8.987= 148.067
2. 6.5/3.140= 2.07006
3. 34.5 x 0.157= 5.4165
4. 45.5 x 0.249= 11.3295
5. 11 x 0.434= 4.774
6. (138.16106)
7. 51.83894
8. 27.283%

Fat Percentage Categories:
Essential Fat Women 10-12% Men 2-4%
Athletes Women 14-20% Men 6-13%
Fitness Women 21-24% Men 14-17%
Acceptable Women 25-31% Men 18-25%
Obese Women 32% + Men 25% +

HA! Fuckers.... I am within acceptable range.

On to hip to waist ratio:
Hip: 45.5
Waist: 34.5
34.5/45.5= 0.7752
Again, within acceptable range.

The WHR has been used as an indicator or measure of the health of a person, and the risk of developing serious health conditions. Research shows that people with "apple-shaped" bodies (with more weight around the waist) face more health risks than those with "pear-shaped" bodies who carry more weight around the hips.
WHR is used as a measurement of obesity, which in turn is a possible indicator of other more serious health conditions.
A WHR of 0.7 for women and 0.9 for men have been shown to correlate strongly with general health and fertility. Women within the 0.7 range have optimal levels of estrogen and are less susceptible to major diseases such as diabetes, cardiovascular disorders and ovarian cancers.[4] Men with WHRs around 0.9, similarly, have been shown to be more healthy and fertile with less prostate cancer and testicular cancer.[5]
WHR has been found to be a more efficient predictor of mortality in older people than waist circumference or body mass index (BMI).[6] If obesity is redefined using WHR instead of BMI, the proportion of people categorized as at risk of heart attack worldwide increases threefold.[7] The body fat percentage is considered to be an even more accurate measure of relative weight. Of these three measurements, only the waist-hip ratio takes account of the differences in body structure. Hence, it is possible for two women to have vastly different body mass indices but the same waist-hip ratio, or to have the same body mass index but vastly different waist-hip ratios.



So which is it? The long handed measurements or the catch all "boogeyman" BMI table? Why do health organizations even use BMI any more? Even by AF military standards, I am acceptable. WTF?

Anyways, the was rant that was a long time coming. I am heavy but I am a work horse. Besides, what's wrong with a 36-34-45?
/rant

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