Is BMI really BS?

It's not just about muscle mass shape means that people who don't have a large lean muscle mass fall outside the BMI range.

What does shape have to do with weight?

So 2 months ago I was considered "overweight"...sorry I have to laugh...at 160lbs..in a size 5/6...not overweight...

Clothing sizes is about the worse marker available when determining appropriate weight.

Almost all clothes in the US are vanity sized, and women's clothing has absolutely no regulations or standards. A 5/6 today can be so vanity sized that it was a 10-12, or higher, in decades past. Even men's clothes no longer follow the actual inches printed on the waist sizes. Hell I have two pairs of jeans from the 90s in a size 36 that are smaller than some size 33s today.

The mirror and your health markers are the best standard, clothing size the absolute worse.

BMI doesn't distinguish between fat and muscle so it's certainly massively flawed

Pick any muscly athlete and BMI will say they are overweight

eg. Running back Adrian Peterson

And yet how much of the general population has a body built like a professional running back?

I am not from the states...and I can tell from the mirror that I was not overweight...and to your point of vanity sizes...I am 41...put my prom dress on while I weighed 165lbs...yes a 20 year old dress...so no vanity sizing there...I was 135lbs when I graduated...it fit like a glove....it was a size 8....I was not overweight at 165 either even tho BMI put me there...

Here is some more history on BMI...it was developed to help the government ie monarchy, distribute goods during lean times in Europe...

Even health care professionals are saying BMI is not the gold standard as it once was thought to be...

As to the professional athletes being in the overweight or even obese category..no they aren't typically but let's be realistic.

Lifters outside of professional athletes and people with larger frames are going to not be able to rely on BMI...me being one..

I have a large frame, I lift heavy and at 165 I was in a 20 year old size 8....I was not obese. I am a normal everyday woman, just like lots of woman here...BMI for individuals is rubbish period....it is good for "general population" in groups.

If you somehow manage to fit in BMI ranges as an individual that means you are "like the average" but that doesn't mean we all are.

That's great. I'm not calling you fat. I don't know you, your body fat percentage, your LBM, or anything.

But check this. You, as an above average muscular woman who lifts heavy weights, still fall within a healthy BMI. For a woman you are a worldwide outlier, and still the BMI range stretches to fit you.

So you've actually supported my point.

For all the moaning and complaining about BMI, the range is still quite wide and still able to fit even some outliers such as yourself.

I do now yes...but 13lbs ago when I fit into a 5/6 today and an 8 from 20 years ago (when I weighed 135) I was considered overweight..that's my point..at 165 I was considered overweight...with a BMI of 25.3 total bull..I was no overweight if I could fit in my prom dress...

BMI is not for individuals it is for "general populations"..averages. It was developed for averages and should be used for averages not indiviuals...

"Grab hold of stomach and wobble up and down - if it jiggles too much then you are overweight" That would work for the majority would it not?

love that.

I am BMI 25.2 but BF ~15% so getting to mid range BMI seems too low to be sensible for me.

Also most of the health benefit is from not being BMI 30+

That's great. I'm not calling you fat. I don't know you, your body fat percentage, your LBM, or anything.

But check this. You, as an above average muscular woman who lifts heavy weights, still fall within a healthy BMI. For a woman you are a worldwide outlier, and still the BMI range stretches to fit you.

So you've actually supported my point.

For all the moaning and complaining about BMI, the range is still quite wide and still able to fit even some outliers such as yourself.

It also proved the point that it's far too simplistic

The OP didn't just want to be 'in the healthy range' according to the BMI charts, she wondered if she needs to move from the 'heavier side of healthy'

Should she lose more weight as she is approaching 'overweight on the BMI scale'?

I don't know, and nor do you, all depends on how much muscle she has etc. Hence in her case, BMI is at best, useless, at worst, very misleading

But this makes no sense.

Being on the heavier side of the "healthy range" is....healthy. For most people.

The fact that she feels she needs to have a lower BMI, even though she's already in the healthy range, and her doctors say she's fine, is a problem SHE is having. It's not a strike against BMI.

If we're going by BMI here, it's actually telling her she's fine, and her doctor has backed that up. As has the mirror, apparently.

While her post launched off a great debate about BMI, her individual story has little to do with the merits of BMI as an indicator of healthy weight....since the BMI already vindicates her as being a healthy weight. Her case actually supports the use of BMI.

It's not just about muscle mass shape means that people who don't have a large lean muscle mass fall outside the BMI range.

What does shape have to do with weight?

If you had seen my previous message I said that although my right weight is smack bang in the middle of the healthy BMI range for my height, my dad's isn't.

He is 6'2" has very short legs for his height (29") and a really long body he is also very broad, if he is within the range for his height he would look very under weight his doctor has given him a suggest weight which is outside the BMI and this has been assessed along with him having asthma and a heart condition.

He doesn't have alot of lean muscle mass but due to his body (where I suspect most of your weight is held) is so big he doesn't fit into the BMI table.

I have an hourglass shape and a BMI of between 21-23 is about the right weight for me.

So it's not just muscle mass but shape.

It's not just about muscle mass shape means that people who don't have a large lean muscle mass fall outside the BMI range.

What does shape have to do with weight?

If you had seen my previous message I said that although my right weight is smack bang in the middle of the healthy BMI range for my height, my dad's isn't.

He is 6'2" has very short legs for his height (29") and a really long body he is also very broad, if he is within the range for his height he would look very under weight his doctor has given him a suggest weight which is outside the BMI and this has been assessed along with him having asthma and a heart condition.

He doesn't have alot of lean muscle mass but due to his body (where I suspect most of your weight is held) is so big he doesn't fit into the BMI table.

I have an hourglass shape and a BMI of between 21-23 is about the right weight for me.

So it's not just muscle mass but shape.

That doesn't have anything to do with "shape".

If your dad isn't fat at a higher weight, than it means he's got a decent amount of lean muscle mass. It doesn't even matter whether you visually assess this, if he's got a low body fat yet a height weight, the man's got quite a bit of muscle.

Is he radically outside of the BMI range?

It's not just about muscle mass shape means that people who don't have a large lean muscle mass fall outside the BMI range.

What does shape have to do with weight?

If you had seen my previous message I said that although my right weight is smack bang in the middle of the healthy BMI range for my height, my dad's isn't.

He is 6'2" has very short legs for his height (29") and a really long body he is also very broad, if he is within the range for his height he would look very under weight his doctor has given him a suggest weight which is outside the BMI and this has been assessed along with him having asthma and a heart condition.

He doesn't have alot of lean muscle mass but due to his body (where I suspect most of your weight is held) is so big he doesn't fit into the BMI table.

I have an hourglass shape and a BMI of between 21-23 is about the right weight for me.

So it's not just muscle mass but shape.

That doesn't have anything to do with "shape".

If your dad isn't fat at a higher weight, than it means he's got a decent amount of lean muscle mass. It doesn't even matter whether you visually assess this, if he's got a low body fat yet a height weight, the man's got quite a bit of muscle.

Is he radically outside of the BMI range?

Sorry but he doesn't have lots of lean muscle but has a huge torse!!! He has never worked out since leaving school although does have manual job but he manily manages rather than actual does any of the work. He is probably at the correct weight around 1 stone into the overweight range.

It's not just about muscle mass shape means that people who don't have a large lean muscle mass fall outside the BMI range.

What does shape have to do with weight?

If you had seen my previous message I said that although my right weight is smack bang in the middle of the healthy BMI range for my height, my dad's isn't.

He is 6'2" has very short legs for his height (29") and a really long body he is also very broad, if he is within the range for his height he would look very under weight his doctor has given him a suggest weight which is outside the BMI and this has been assessed along with him having asthma and a heart condition.

He doesn't have alot of lean muscle mass but due to his body (where I suspect most of your weight is held) is so big he doesn't fit into the BMI table.

I have an hourglass shape and a BMI of between 21-23 is about the right weight for me.

So it's not just muscle mass but shape.

That doesn't have anything to do with "shape".

If your dad isn't fat at a higher weight, than it means he's got a decent amount of lean muscle mass. It doesn't even matter whether you visually assess this, if he's got a low body fat yet a height weight, the man's got quite a bit of muscle.

Is he radically outside of the BMI range?

Sorry but he doesn't have lots of lean muscle but has a huge torse!!! He has never worked out since leaving school although does have manual job but he manily manages rather than actual does any of the work. He is probably at the correct weight around 1 stone into the overweight range.

Have you seen a comprehensive breakdown of your dad's bodyfat vs his LBM?

What do you imagine his "huge torso" is comprised of, assuming he's far outside of the BMI range when he's at a healthy, non-fat weight?
[/quote

So someone who doesn't exercise just aquires lots of lean muscle??

If he did work out and had lots of lean muscle he'd be even heavier.

Human variation is more varied than most people realise it is. And it's not that hard for a medium to large framed person to add enough muscle mass to their body to put themselves in the overweight or even obese range of BMI while their body fat percentage is in the healthy range. And for people who got more than their fair share of neanderthal genes, it's even easier.

But the BMI range actually well covers even larger framed people, and definitely medium framed.

Again, all this talk of variation now, when we're fatter than ever. The BMI range has quite a lot of variation.

The difference is that we're getting so fat, collectively, that we're outgrowing the already wide BMI variation.

Talking at a population level... yes

but talking at an individual level.... no

I have a large frame, and the weight at which I'm strongest and feel healthiest and look best - 140lb... is in the "overweight" range of BMI... meanwhile my lean body mass (107lb) is in the healthy range of BMI for my height which is 100-132lb, as in my lean body mass is more than some women of my height's entire body weight).... at 125lb I was losing strength and lean body mass, I went from being able to do full push-ups easily to barely being able to do full push-ups at all. The amount of weight I could lift was going down and I was tired and run down all the time.... This was in spite of eating enough calories, protein and lifting weights... it was that weight is too low for my height and frame size. But BMI says that 125lb is at the high end of the healthy range for my height, and most women (including the OP) view "high end of the healthy range" as "not good enough" - without any consideration of the fact that not everyone is average........... if I thought like that then I'd never be happy with my body, ever unless I starved off about 20lb lean body mass which is extremely unhealthy.

My point is that by promoting BMI as being "okay for most people so no-one should complain about it" you're putting people like myself in danger of trying to diet down to weights that are unhealthy for their frame size.... you don't understand the psychological stress that I was put under, age 17, by being told to lose 10kg (22lb) by someone who only took BMI into account and didn't notice that I already was very lean, and right at the low end of the healthy body fat percentage range - I had no idea that they were wrong, so actually tried very, very hard to do this... this put my physical and mental health in danger and I suffered from disordered eating for years (never actually became a full blown eating disorder, but it could have done and it could do in others). Seriously, you have no idea the mental stress I was put through from that.

And now I'm expected to just say "oh yeah, BMI's fine because it works for most people" - sorry but no. Outliers exist. And BMI is potentially very dangerous when misapplied to them. And it wasn't just one adult who told me that... at least two others told me I was "almost overweight" and "had to be careful" - how is that okay advice to give to an adolescent girl who has a low body fat percentage? (my upper abs were visible at the time!)........ really if it wasn't for the fact that I went on to study human sciences at university, and learn about actual human variation and how BMI is a really poor metric for health and just how easy it is to be in the "overweight" or even "obese" range of BMI when your body fat percentage is in the healthy range, then I'd probably right now hate my body and probably would have succeeded in starving off a lot of my lean body mass and ended up being skinny-fat and unhealthy, and paranoid about being overweight like I was age 17 when I should have been happy and seen myself as what I was - fit. very healthy and beautiful.

Turns out (also from the physiology lab at uni) that I'm also an extreme outlier in lung capacity... my lung capacity for my height is not even close to the normal range.... this goes with the fact that my rib cage and shoulders are huge, while I'm short (I don't call myself neandermagnon for nothing lol), which also explains why I have such a high lean body mass for my height.

Seriously, no-ones disputing your point about populations and averages... but not everyone is average and criticising people for questioning the use of BMI as a diagnostic tool for individuals is potentially dangerous because of the physical and mental health risks to people who are outliers in trying to make them average. Because that's what BMI seeks to do... make non-average people average. People who are outliers in the other direction are also at risk, being expected to gain weight to make them average when they're healthy in the underweight range of BMI... one friend of mine who's in the underweight BMI range has even had her sanity called into question because she refused to gain weight to meet the BMI standard.. she's the opposite of me, very tiny frame. But we're both healthy. She eats loads and lifts weights, she's just built very tiny..... and we're both part of the normal range of human variation... even if we're at opposite ends of the range.

Another thing about being an outlier is that you're an outlier for your whole entire life, so you have to put up with this kind of crap repeatedly. And it can take its toll and lead to paranoia and self-hatred when you're constantly being told that you're too heavy because you're not average, and a lot of people who are outliers don't realise that they're outliers until they've already done a lot of damage to their body and mind.