3 Fat Chicks on a Diet Weight Loss Community  

Go Back   3 Fat Chicks on a Diet Weight Loss Community > Support Forum > Weight Loss Support

Weight Loss Support Give and get support here!

Discrepancy between BMI and Body Fat Percentage

Reply
 
Thread Tools
Old 05-21-2010, 02:37 PM   #1
Guy on a Diet
 
Join Date: May 2010
Location: California
Posts: 78

S/C/G: 448/253/183

Height: 6'0"

Default Discrepancy between BMI and Body Fat Percentage

Has anyone ever measured there Body Fat Percentage? I did the measuring one the other day, where you measure your wrists and your waist and thighs and such, and there's a huge discrepancy. And, I was wondering if anyone else can relate.

I took both the U.S. Army and the U.S. Navy formulas. I find the U.S. Navy formula slightly more believable. According to the USA Format, I'm at 33.65% body fat, and the U.S. Navy formula is 44.30%.

Which gives me a BMI waist-to-hip ratio of >1.2. To be an obese man, it's over >.9 and on a woman it's >.85.

According to the Army formula, this gives me a lean body mass of 191.6 lbs, and the U.S. Army formula is 160 lbs, which I find more believable.

But if I were to believe these numbers, basically I BARELY qualify to be obese in terms of Body Fat Percentage, and yet my BMI shows that I am most severely obese, that is to say 38 BMI or Class II Obesity (Severe Obesity).

The thing that puzzles me is: Maybe I measured wrong, but I DO have thin extremities, like I have small to medium wrists for a man: 7 inches. I can wrap fingers around and do all the stuff that very thin people can do with their wrists.

And, when I get to 260 lbs, things like my collar bones stick out prominently, and I have a thin face and legs, which leads many when I get to around 260 to say that I'm "no longer fat", just a bit pudgy, and I will get comments on how I'm thin and that I can eat whatever I want and all this. It gets weird.

Bottom line is, does anybody else have mismatched measures like me. I don't lift weights or anything, and I can't claim to be "big boned" with my wrists, lol. But is it really possible I could have a lean body mass of 191 lbs?? or even 160? (which I find a more believable number). I don't rule out that I could have more muscle than I realize simply because it takes muscle to lug around this much weight.

So basically: anybody else? And, how do I stack up to others in terms of body fat percentage? I dunno normal, and it's hard to google this information.

Last edited by Thin Desire : 05-21-2010 at 03:03 PM.
Thin Desire is offline   Reply With Quote
Old 05-21-2010, 02:53 PM   #2
Senior Member
 
girlonfire's Avatar
 
Join Date: Dec 2008
Posts: 1,231

Default

Yup! I do. According to BMI and weight, I am hugely obese and while I am definitely overweight, I get shocked looks when people find out my weight and by people I mean my doctor. I guess it's weird that someone who is 5'4" and almost 250 pounds can wear a size 16/14.
__________________


Starting Weight: 280
Minigoal #1- 260
girlonfire is offline   Reply With Quote
Old 05-21-2010, 04:13 PM   #3
Senior Member
 
Join Date: May 2003
Location: Ontario's West Coast
Posts: 13,984

S/C/G: 165/147/128

Height: 5'3"

Default

I always think of BMI as being sorta like how many square yards of skin you are. Body fat is about density. You can have a very good BMI but if it's all soft fluffy fat, then you'll have a higher body fat percentage. Conversely, a super well muscled athlete can have a crappy BMI because his muscle is so heavy.

Does that make sense?
__________________
... Susan
Eat good food. Move yourself. Lift something.
srmb60 is offline   Reply With Quote
Old 05-21-2010, 04:27 PM   #4
Senior Member
 
crcossel's Avatar
 
Join Date: Jul 2009
Location: Miami, Florida
Posts: 279

S/C/G: 165.6/158.4/130

Height: 5'7"

Default

Why don't you go to the gym and have your body fat tested? Much more accurate.
__________________
Candice

crcossel is offline   Reply With Quote
Old 05-21-2010, 04:49 PM   #5
I'm Just a Little Crazy
 
SCraver's Avatar
 
Join Date: Jan 2008
Location: Willington, CT
Posts: 1,404

S/C/G: 250/215/170

Height: 5'9"

Default





Not sure if the pictures will work... (They came from here: http://www.leighpeele.com/body-fat-p...nd-percentages )

I thought they were interesting how different two people with the same body fat % could look very different.

I think comparing BMI and fat % is like comparing apples to oranges. Beside that part where I think BMI is a crock, it is just considers height and weight. While fat % is about the make up of your body.
__________________


"I'd rather waltz than just walk through the forrest"

Little Goals:
- Sprint Triathlon: 9/11/2011
- Half Marathon: 9/18/2011
- Weigh under 210: GOAL!!! As of 7/16/2010
- Next goal: Get BACK to under 210

Last edited by SCraver : 05-21-2010 at 04:50 PM.
SCraver is offline   Reply With Quote
Reply
Posts by members, moderators and admins are not considered medical advice
and no guarantee is made against accuracy.


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


All times are GMT -4. The time now is 01:05 AM.






Powered by vBulletin® Version 3.6.7
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.3.2