Overweight based on BMI or Body Fat %??
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EvgeniZyntx wrote: »
That's really best case scenario though. In women and adolescents there is a lot of evidence that the specificity of BMI to identify obesity is very low.
http://ajcn.nutrition.org/content/80/3/597.full
" Thus, many overweight female adolescents could be missed in intervention programs that use the proposed international BMI cutoffs as selection criteria."
Interesting. Not sure I expected the bias to be that way.0 -
Packerjohn wrote: »
Or loose skin...0 -
Thanks for the feedback everyone! I am only 5lbs overweight according to BMI. I think its totally possible I have 5lbs extra muscle than an average female my height. I used to have manual labor job, now I cycle up mountains and run. My resting heart rate is 42 bpm. Overweight or not, I still want to lose 40lbs...but my first weight loss goal of being "normal weight" seems more arbitrary now...1
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Thanks for the feedback everyone! I am only 5lbs overweight according to BMI. I think its totally possible I have 5lbs extra muscle than an average female my height. I used to have manual labor job, now I cycle up mountains and run. My resting heart rate is 42 bpm. Overweight or not, I still want to lose 40lbs...but my first weight loss goal of being "normal weight" seems more arbitrary now...
You want to lose 40 more pounds from here?
What's your frame size?0 -
You may need to review your goals once you lose another 10 lbs - 40 is likely to result in significant LBM loss.0
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kshama2001 wrote: »Thanks for the feedback everyone! I am only 5lbs overweight according to BMI. I think its totally possible I have 5lbs extra muscle than an average female my height. I used to have manual labor job, now I cycle up mountains and run. My resting heart rate is 42 bpm. Overweight or not, I still want to lose 40lbs...but my first weight loss goal of being "normal weight" seems more arbitrary now...
You want to lose 40 more pounds from here?
What's your frame size?
https://www.dropbox.com/s/z7ixun22k9cmlyu/image.jpeg?dl=0
This is me exactly 40 pounds lighter. I'm 5'9" average frame. I carry all my weight in my legs and neither of these pictures show them. Hill climbing cyclists tend to be very skinny while just keeping enough muscle to get them up hills.0 -
BMI works for large swaths of the population but not individuals. It doesn't take into account muscle mass. You are much better suited to use the scale, measuring tape, body fat calipers, and mirror to judge where you are and where you want to be.1
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I was shocked when I went to the Dr this year my BMI has gone up but my fitness and muscle tone is much increased. I recall the old ad "pinch an inch" to determine if you are over fat. I no longer can pinch any fat on my sides. So I dont want to be deluding myself about my fitness but I dont think my gain is fat.0
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EvgeniZyntx wrote: »Packerjohn wrote: »Packerjohn wrote: »My problem with BMI is that it doesn't factor in your level of fitness, it's just height & weight. Pretty arbitrary. You look great in your pic, I wouldn't worry much.
BMI works for 80% or so of the population reliably. If someone has been doing resistance training or a manual labor job they may be overweight by bmi but an acceptable level of bodyfat. Otherwise moat likely not.
I'm not doubting your statistics, I'm just curious as to where you got the information.
Here is a sample:
http://www.sciencedirect.com/science/article/pii/S221133551500073X
Highlights
o The accuracy of age adjusted BMI for passing or failing body fat standards was 83%.
o The correlation between BMI and % body fat as determined by DEXA was 0.86
o An equation was derived to estimate % body fat: % body fat = 1.3974(BMI) − 19.166.
o Soldiers with a BMI of 27.5 < 30 had 10 kg more fat mass than Soldiers with a BMI < 25.
o Soldiers with a BMI of ≥ 30 had 17 kg more fat mass than Soldiers with a BMI < 25.
Thank you for a good science based article. Appreciate the info.
That's really best case scenario though. In women and adolescents there is a lot of evidence that the specificity of BMI to identify obesity is very low.
http://ajcn.nutrition.org/content/80/3/597.full
http://www.nature.com/ijo/journal/v32/n1s/full/ijo200887a.html
This study was done on a much larger sample (~12k ) with varying age groups and both genders and found about a .8 correlation for women. Body fat was determined by DEXA.
http://m.ajcn.nutrition.org/content/89/2/500.full
RESULTS
Basic descriptive information about the analytic sample is shown in Table 1. Differences in mean values between men and women were tested by using a 2-sample t test for complex survey data (14). Pearson correlations between percentage fat, BMI, WC, and WSR are shown in Table 2 by sex and age group. Correlations by race-ethnicity group within sex and age groups were similar to those seen overall (data not shown). All correlations were significantly greater than zero (P < 0.0001). For men, the correlations between percentage fat and BMI ranged from 0.789 (20–39 y of age) to 0.716 (≥80 y of age). The corresponding values for women were 0.839 and 0.724. For comparisons between pairs of correlations, statistical significance was based on a P value of 0.00045, which was equivalent to a P value of < 0.05 after Bonferroni correction.0 -
Which determines if a person is actually overweight?
I know BMI isn't very reliable and accurate like Body Fat %
Im confused by there not being an "overweight" range for body fat. It just goes from "acceptable" to "obese" I am ~30% Body Fat aka "acceptable" based on my handheld Omron Body Fat Analyzer. My BMI is 25.7 aka "overweight"
Wonder if anyone else has experience being on the cusp of overweight/normal and what their BMI/Body Fat numbers looked like?
I have a pic for reference if anyones curious.
https://www.dropbox.com/s/z7ixun22k9cmlyu/image.jpeg?dl=0
I'm glad you posted this! I was confused by the same thing. My BMI is 25 which is overweight/almost normal BMI cusp. But when I did the military body fat quiz I came up as 30% body fat. I am still shaken from this.0 -
MakePeasNotWar wrote: »EvgeniZyntx wrote: »Packerjohn wrote: »Packerjohn wrote: »My problem with BMI is that it doesn't factor in your level of fitness, it's just height & weight. Pretty arbitrary. You look great in your pic, I wouldn't worry much.
BMI works for 80% or so of the population reliably. If someone has been doing resistance training or a manual labor job they may be overweight by bmi but an acceptable level of bodyfat. Otherwise moat likely not.
I'm not doubting your statistics, I'm just curious as to where you got the information.
Here is a sample:
http://www.sciencedirect.com/science/article/pii/S221133551500073X
Highlights
o The accuracy of age adjusted BMI for passing or failing body fat standards was 83%.
o The correlation between BMI and % body fat as determined by DEXA was 0.86
o An equation was derived to estimate % body fat: % body fat = 1.3974(BMI) − 19.166.
o Soldiers with a BMI of 27.5 < 30 had 10 kg more fat mass than Soldiers with a BMI < 25.
o Soldiers with a BMI of ≥ 30 had 17 kg more fat mass than Soldiers with a BMI < 25.
Thank you for a good science based article. Appreciate the info.
That's really best case scenario though. In women and adolescents there is a lot of evidence that the specificity of BMI to identify obesity is very low.
http://ajcn.nutrition.org/content/80/3/597.full
http://www.nature.com/ijo/journal/v32/n1s/full/ijo200887a.html
This study was done on a much larger sample (~12k ) with varying age groups and both genders and found about a .8 correlation for women. Body fat was determined by DEXA.
http://m.ajcn.nutrition.org/content/89/2/500.full
RESULTS
Basic descriptive information about the analytic sample is shown in Table 1. Differences in mean values between men and women were tested by using a 2-sample t test for complex survey data (14). Pearson correlations between percentage fat, BMI, WC, and WSR are shown in Table 2 by sex and age group. Correlations by race-ethnicity group within sex and age groups were similar to those seen overall (data not shown). All correlations were significantly greater than zero (P < 0.0001). For men, the correlations between percentage fat and BMI ranged from 0.789 (20–39 y of age) to 0.716 (≥80 y of age). The corresponding values for women were 0.839 and 0.724. For comparisons between pairs of correlations, statistical significance was based on a P value of 0.00045, which was equivalent to a P value of < 0.05 after Bonferroni correction.
Which corresponds with the first study posted.0 -
Unfortunately, I can't see a link to the original study, but assuming this description is accurate (and the numbers seem to agree with what I've seen elsewhere), it's rare to find a person who is overweight by BMI standards but in the normal range of body fat percentage. Most of the misclassification is due to normal weight obesity.
This article gives 5% as the proportion of overweight subjects who were lean, but it is for both genders and I have seen (and am trying to find the reference) a 3% estimate for women.
http://blogs.plos.org/obesitypanacea/2015/04/30/30-of-people-with-a-healthy-bmi-are-actually-obese/0 -
macchiatto wrote: »You look great in your pic! I don't think there's any way you're overweight. I'm guessing your body fat percentage is a bit lower than the 30%.
I think her actual body fat is lower also. I look a lot "thicker" than OP and have the same body fat %.0
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