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BMI

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BMI

Postby Schteve » Mon Oct 01, 2007 5:10 pm

So how good do you think BMI really is as an indicator of whether you need to lose weight or not and how much? Sure it can be ok as a rough guide, but I think there are lots of important things it doesn't consider.

Just for fun, I decided to calculate Jonathon Brown's (Brisbane forward and one of the fittest men in the AFL) BMI. It turns out he is overweight and should eat less, and do a 45 minute walk every day! :roll:

Another example, bone density. Bones are heavy, and on my father's side of the family they tend to have very dense bones, which tends to make them heavy even if they don't look overweight.

Also, I have read many times on this forum that muscle is heavier than fat. If you are working out a lot to lose weight, and replace the fat with muscle, aren't you going to get heavier?
What do you think?
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Postby talia11 » Mon Oct 01, 2007 6:14 pm

you are right scteve - it is a bit of a crock in terms of measuring weight loss - it does not take into account any muscle mass.
I don't know how it all works out, but my hubby (who used to be a physical trainign instructor in the army) says that you are better doing measurements than anything else if you are gaguing weight loss and you are right - your muscles do weight more.....and of course BMI does not take that into account - when I satrted my diet - I was classed in the Obese range - and there is no way in hell I was obese - overwieght yes, but obese no..
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Postby HappyBella55 » Mon Oct 01, 2007 7:45 pm

My doc told me that they only use the BMI as a guide only.

She also said the best indicator (aside from the obvious visual aspects) is a body fat percentage test.
Start weight - 77kgs
Goal weight - 53kgs
Current Weight - 50.1kgs


No more weighing, no more scales. My measurement is my success at health. It's an investment I make every single day. My priority: be healthy!
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Postby Butterfly_Dawn » Mon Oct 01, 2007 7:47 pm

ditto - my fave argument against using BMI as the sole indicator of weight loss needs is footy players/weightlifters/boxers. Now I challenge anyone to tell one of those guys they're obese and live to talk about it!!!

It is a good tool, so long as you can acknowledge it's weaknesses.
35kg lost. (November 2005 - October 2006)
15kg gained again (as at October 2010).
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Re: BMI

Postby help6363 » Mon Oct 01, 2007 10:54 pm

Schteve wrote:So how good do you think BMI really is as an indicator of whether you need to lose weight or not and how much? Sure it can be ok as a rough guide, but I think there are lots of important things it doesn't consider.

Just for fun, I decided to calculate Jonathon Brown's (Brisbane forward and one of the fittest men in the AFL) BMI. It turns out he is overweight and should eat less, and do a 45 minute walk every day! :roll:

Another example, bone density. Bones are heavy, and on my father's side of the family they tend to have very dense bones, which tends to make them heavy even if they don't look overweight.

Also, I have read many times on this forum that muscle is heavier than fat. If you are working out a lot to lose weight, and replace the fat with muscle, aren't you going to get heavier?
What do you think?


I used to only follow the BMI....now I go % of fat measured at the gym. However, I still weigh myself.
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Postby MissE » Tue Oct 02, 2007 10:49 am

I have the same problem with BMI. I think its only really useful when working out if someone is underweight.
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