Limitations of the Body Mass Index (BMI)

by Noel Chelliah on Monday, Jan 9, 2006

weighing scaleI was reading up some material on the BMI a few days ago and made an interesting find.

As you probably are aware, many people rely on the BMI (Body Mass Index) to be a reliable way of measuring total body fat based on height and weight.

The end result is a score which will determine which of the following category you fall into:

1. Underweight
2. Healthy/normal weight
3. Overweight
4. Obese

The BMI is generally reliable and used worldwide, with the score valid for both men and women but it does have some limitations (which most people sometimes dont realise and fail to take into account – especially athletes). Especially of interest to me is the following limitation:

The BMI may overestimate body fat in athletes and bodybuilders

This is because heavier muscle weight WILL affect the results as muscle tissue is heavier/more dense than ordinary tissue/fat.

A couple of years ago I remember calculating my BMI and it said that I was obese when I was clearly not! I’m glad that I now know why that was. And now you know too.


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This post was written by...

Noel Chelliah

Noel Chelliah, ACE-CPT, ACE-LWMC, has been recognized as one of the Top Transformation Experts in Malaysia. No stranger to being overweight himself, Noel has gone through a life-changing transformation himself, from fat, to fit. In 2010, Noel founded the DailyMuscle Body Transformation Camp, which today helps hundreds of individuals exercise and practice healthier habits. In his spare time, Noel serves the community with various programs that promote a healthier lifestyle, and enjoys playing with his dogs.

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{ 9 comments… read them below or add one }

Balajoe January 9, 2006 at 5:41 pm

Finally…someone who confirmed what I suspected for a long time now (I am heavier than someone who is fat at my office) but still, I have to work out to reduce the “more than the average” tummy

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dailymuscle January 9, 2006 at 7:55 pm

I’m heavier than most people too, even the obvious overweight ones. I’ve got a friend who’s shorter than me, perfectly normal looking physique – but yet, he weighs about 7kg heavier than me. Amazing.

I’ve got a tummy that needs work too. But hey, who doesnt? :)
Good luck.

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surfnux January 10, 2006 at 1:59 pm

I used to get an average weight before college. Soon after college, I get weight easily and its all stayed around that range only. My shoulder is getting bigger and the upper body is getting thicker. With a not so shaped body, people who sees me will say I am obese. Indeed I feel I am not so (previously), but now it is, since the stomach is getting bigger and bigger.

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dailymuscle January 11, 2006 at 8:48 am

Surfnux.. perhaps you could give the BMI a try and see what it says. There are loads of BMI calculators available online.. here’s one: http://nhlbisupport.com/bmi/bmi-m.htm.

Since you’re not an athlete/bodybuilder, the results would more or less determine your type accurately.

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surfnux January 11, 2006 at 5:29 pm

Well thanks. Going to try it.

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dailymuscle February 1, 2006 at 3:34 pm

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jill January 29, 2008 at 5:53 pm

I have 34G breasts, surely they must weigh a lot, I would not consider myself as “overweight” although obviously I could do with losing some. It annoys me how everything diet wise is based on BMI yet BMI does not take into account that these things attatched to my chest obviously weigh a lot more than someone who had a B cup for example!!!

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trey January 29, 2008 at 11:52 pm

A couple of years ago I remember calculating my BMI and it said that I was obese when I was clearly not! I’m glad that I now know why that was. And now you know too.

Reply

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