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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

To think someone that’s 7 stone and 5’4 is tiny

255 replies

101360i · 29/12/2025 14:31

And to be worried d

OP posts:
Itsmetheflamingo · 30/12/2025 11:07

BringBackCatsEyes · 30/12/2025 11:00

That's why the range is so wide. There are outliers like professional rugby players, Olympic weight lifters and gymnasts.This is indeed a limitation of BMI, but those people will absolutely be aware of this.

It is one metric and one that is very easy to assess and for most people it is helpful.

This. I get so fed up of people using weightlifters and athletes as examples as to why they can’t fit into BMi. Well neither do supermodels and you’re not one of those either.

added to which, athletes, supermodels and weightlifters are not necessarily healthy at all. They are disciplines with high levels of eating disorder and unnatural punishing of the body which often leaves their bodies ruined well before middle age.

DeftGoldHedgehog · 30/12/2025 11:08

DD1 is 20, about nine stone and 5'4" and a size six. So, yes, two stone lighter is very thin.

DyslexicPoster · 30/12/2025 11:16

I'm not sure you will get objective replies on mn. My friend was the same height and weighed much less. Told me she was under the hospital for potential issues why she couldn't absorb food. She would eat half a finger roll at lunch and restricted her diet. Mil is 5,5 and weighs five and a half stone and has been a lot less. They are just accepted as aspirational. I know both are too thin.

However my son was 5,8 and weighed under 8 stones. Appeared very healthy. Couldn't pass his motor bike test as couldn't hold up the bike.

I'd say common sense says its too thin. However lots of people praise all the above figures. My ds was home from uni in the most oversized outfit I have ever seen him in. No idea how much he weighs now. Some people are worried about him.but plenty more praise his figure. I haven't seen him in fitted clothes for over 7 years. It's a big worry that no one else sees.

cinquanta · 30/12/2025 11:20

Aluna · 30/12/2025 10:09

Because, as has been explained, BMI are simply guidelines and don’t account for build and muscle mass.

There will be many men and women like my brother with big frames, a lot of muscle mass, little fat, who register in the unhealthy range.

But they do, that is why they are such a wide range. In Asia the WHO and various national health authorities have seen fit to narrow the range with the overweight cut off reduced to 22.9. If there really is an issue with 18.5 for the Asian underweight limit, why hasn’t that been reduced too?

Itsmetheflamingo · 30/12/2025 11:27

I don’t understand why there is so much discussion about Asian BMI. It doesn’t impact anyone who isn’t (east?) Asian. It wouldn’t have any impact on underweight white British people.

it almost sounds like posters are trying to legitimise reducing the underweight BMi so more people currently underweight can be considered normal weight.

UK BMI already adjusts for ethnicity to some extent, mainly reflecting the older British Caribbean and Indian origin population who (unfortunately for them) generically should be lighter than white Europeans to stay at a comparable risk of heart disease and stroke.

cinquanta · 30/12/2025 12:39

I don’t understand why there is so much discussion about Asian BMI. It doesn’t impact anyone who isn’t (east?) Asian. It wouldn’t have any impact on underweight white British people.

Nor me. It just isn’t relevant and seems to be based on assumptions rather than science.

It’s just the same with the weight lifting argument at the other end of the scale. As well as my day job I am a gym instructor and P/T. I used to lift heavy weights and even when I was training for body building competitions I never even came close to the top of the healthy BMI range. It was barely 20.

Flingotheflamingo · 30/12/2025 12:43

I’m 5ft 2 and weight 7st. Actually might be a lb or 2 under actually atm.

I work full time, breastfed 2 babies, have a regular period and I’m perfectly healthy.

I also wobble.

themerchentofvenus · 30/12/2025 12:48

101360i · 29/12/2025 14:31

And to be worried d

It's not what I'd say was worrying.

It gives them a BMI of 16.8. This classifies as underweight, but then it depends on so many genetic factors, build etc... Are they tired and struggling with energy? Are they eating lots and very active or low weight due to a very low food intake?

My BMI was 17.4 at one point but I was healthy. Just VERY active and busy. Yes I looked skinny (I'm almost 5'11) but I ate loads.

KimberleyClark · 30/12/2025 12:48

mikado1 · 29/12/2025 15:04

Ah ok so it's a bigger frame that looks smaller when lighter? Interesting. I look like a big eyed lollipop head much under 8.5 stone. Top half looks particularly skinny, like I'm elderly and underweight if that makes sense!

Yes, I’m 5ft 2 but nothing about me is slight! I have wide shoulders and hips, large hands and feet, big boobs and bum. My minimum healthy weight according to BMI would be 7 stone 5, but even at 8.5 stone I was a size 6-8.

ObelixtheGaul · 30/12/2025 12:49

This reply has been deleted

Message deleted by MNHQ. Here's a link to our Talk Guidelines.

HighStreetOtter · 30/12/2025 12:53

Adult Dd used to be this weight and the practice nurse used to have her in regularly to weigh her as they said she was underweight. She does have a physical medical condition which causes her to struggle eat, not that they do anything about it, but guess at least they were monitoring her.

Itsmetheflamingo · 30/12/2025 13:00

@ObelixtheGaul I’m being told your post has been deleted but replying to it anyway.

it was referring to the unfairness of commenting on thin bodies when no one would do so to a fat body.

I think the deliberate mixing up of lines isn’t helpful either.

small, thin, naturally skinny people aren’t underweight. They may or may not be healthy, but let’s give them the benefit of the doubt and say they don’t have an eating disorder.

Underweight people will have a physical and or mental health problem. A physical illness that makes them lose weight, or anorexia.

let’s not muddy the waters by pretending this isn’t the case.

as a poster above said, it’s not about how people look wandering around in their clothes. It’s about their heart being strained, their brains being staved, having vitamin deficiencies. It is obtuse to pretend this is the same as being thin.

it reminds me of the past on here where wealthy people try and compare their lives to billionaires when in reality they have nothing in common.

Aluna · 30/12/2025 13:19

cinquanta · 30/12/2025 11:20

But they do, that is why they are such a wide range. In Asia the WHO and various national health authorities have seen fit to narrow the range with the overweight cut off reduced to 22.9. If there really is an issue with 18.5 for the Asian underweight limit, why hasn’t that been reduced too?

Edited

As already noted BMI are broadbrush guidelines. They are a useful screening tool for populations but don’t show body composition thus making it an inaccurate individual health indicator.

BMI does not account for muscle; it measures total weight relative to height, failing to distinguish between fat and lean mass, which means very muscular people (like athletes) can have high BMIs classifying them as overweight or obese despite low body fat; and small-framed people with less muscle end up classified as underweight.

Posters on the thread have given personal examples of this, and the example of the experiences of Asian women has also been given.

If at this point you still cannot grasp this, that’s on you.

Mithral · 30/12/2025 13:30

BMI bands are weird as well in fact lowest mortality is found in the moderately overweight category.

Itsmetheflamingo · 30/12/2025 13:31

Aluna · 30/12/2025 13:19

As already noted BMI are broadbrush guidelines. They are a useful screening tool for populations but don’t show body composition thus making it an inaccurate individual health indicator.

BMI does not account for muscle; it measures total weight relative to height, failing to distinguish between fat and lean mass, which means very muscular people (like athletes) can have high BMIs classifying them as overweight or obese despite low body fat; and small-framed people with less muscle end up classified as underweight.

Posters on the thread have given personal examples of this, and the example of the experiences of Asian women has also been given.

If at this point you still cannot grasp this, that’s on you.

The point is to stop applying outliers to the general population.

Chipsahoy · 30/12/2025 13:32

I am that size and weight. Perfectly healthy thank you. Have decent arm and leg muscles thanks to yoga and weights.
I have been this weight all my life. I have a tiny frame and very long legs. It’s who I am genetically as many in my family the same. My oldest is very light and thin and small too.

BringBackCatsEyes · 30/12/2025 13:36

thus making it an inaccurate individual health indicator.

I disagree. It's a good starting point. Someone lying outside their ideal range has something going on. It's going to be clear if they are an Olympic gymnast or a world class sumo wrestler. For everyone else, it's unlikely that them lying outside of the healthy range is due to very low or very high muscles composition.

Most people whose BMI is above the healthy range are indeed carrying too much weight.

Aluna · 30/12/2025 13:37

Itsmetheflamingo · 30/12/2025 13:31

The point is to stop applying outliers to the general population.

They are the general population.

ObelixtheGaul · 30/12/2025 13:38

Itsmetheflamingo · 30/12/2025 13:00

@ObelixtheGaul I’m being told your post has been deleted but replying to it anyway.

it was referring to the unfairness of commenting on thin bodies when no one would do so to a fat body.

I think the deliberate mixing up of lines isn’t helpful either.

small, thin, naturally skinny people aren’t underweight. They may or may not be healthy, but let’s give them the benefit of the doubt and say they don’t have an eating disorder.

Underweight people will have a physical and or mental health problem. A physical illness that makes them lose weight, or anorexia.

let’s not muddy the waters by pretending this isn’t the case.

as a poster above said, it’s not about how people look wandering around in their clothes. It’s about their heart being strained, their brains being staved, having vitamin deficiencies. It is obtuse to pretend this is the same as being thin.

it reminds me of the past on here where wealthy people try and compare their lives to billionaires when in reality they have nothing in common.

I was 'underweight' according to guidelines. I didn't have physical or mental health problems, I just had a very physical job at the time.

I'm not pretending that being underweight is the same as being thin, I'm saying that you simply can't tell from looking at the number on the scales that someone is starving their body/deficient in nutrients, etc. All we have to go on from the OP is a number on the scales. Nothing about lifestyle, eating habits, fitness routine.

I wouldn't assume from a post simply stating someone's weight and height that they had an eating disorder, or lacked nutrients, or were going to be diabetic, etc, because I know nothing about them. I was responding to a post which stated that people were falling over themselves to justify low weight, yet I see the equivalent all the time with people of a weight outside the official guidelines in the other direction.

For me, as the poster I was replying to said, it does indeed go both ways, and I'm sorry but most (and rightly so) would find an equivalent post about someone's weight in the other direction would find it rather abhorrent. As the other post I referenced (which is presumably why mine got deleted) referring to 'teeny-tinies'.

Can you imagine if I responded to a post asking about 'concern' for someone outside the NHS guidelines in the other direction as 'fatty-watty who claims to eat less than they do?'

I'd never do that. Yet my post has been deleted whilst 'teeny-tinies' remains. A nasty little post about how we're all lying about what we eat. Nice, but apparently acceptable.

wonderstuff · 30/12/2025 13:41

I’m 5’4” and I think being 8st would put me in normal range on bmi, bmi is of course a nonsense measurement! I recently went below 7st and it was because I wasn’t eating well, I was signed off work, combo of stress, perimenopause, adhd and vitamin deficiency. I’ve put on 4lbs, which was my normal weight in my 20s, my clothes are fitting a bit better, but I was up to 8st last summer and that’s probably a healthier weight for me at my age ( mid 40s). It can be very difficult to gain weight and people are very dismissive about low weight, the number of times I’m told I’m lucky to be thin, when actually health outcomes when you’re underweight really aren’t great.

BringBackCatsEyes · 30/12/2025 13:43

Aluna · 30/12/2025 13:37

They are the general population.

Not really - from a body composition POV I do not place elite athletes among the general population.

Itsmetheflamingo · 30/12/2025 13:44

Aluna · 30/12/2025 13:37

They are the general population.

By definition, outliers are not the general population. That’s the point.

Itsmetheflamingo · 30/12/2025 13:45

ObelixtheGaul · 30/12/2025 13:38

I was 'underweight' according to guidelines. I didn't have physical or mental health problems, I just had a very physical job at the time.

I'm not pretending that being underweight is the same as being thin, I'm saying that you simply can't tell from looking at the number on the scales that someone is starving their body/deficient in nutrients, etc. All we have to go on from the OP is a number on the scales. Nothing about lifestyle, eating habits, fitness routine.

I wouldn't assume from a post simply stating someone's weight and height that they had an eating disorder, or lacked nutrients, or were going to be diabetic, etc, because I know nothing about them. I was responding to a post which stated that people were falling over themselves to justify low weight, yet I see the equivalent all the time with people of a weight outside the official guidelines in the other direction.

For me, as the poster I was replying to said, it does indeed go both ways, and I'm sorry but most (and rightly so) would find an equivalent post about someone's weight in the other direction would find it rather abhorrent. As the other post I referenced (which is presumably why mine got deleted) referring to 'teeny-tinies'.

Can you imagine if I responded to a post asking about 'concern' for someone outside the NHS guidelines in the other direction as 'fatty-watty who claims to eat less than they do?'

I'd never do that. Yet my post has been deleted whilst 'teeny-tinies' remains. A nasty little post about how we're all lying about what we eat. Nice, but apparently acceptable.

Btw I don’t know why your post was deleted and didn’t find it in the slightest unacceptable

Aluna · 30/12/2025 13:55

BringBackCatsEyes · 30/12/2025 13:43

Not really - from a body composition POV I do not place elite athletes among the general population.

Not all athletes are “elite” whatever that means - many are amateur, then you factor in gym, sports, fitness enthusiasts of all types, weight training, body builders, armed forces, security services, police and emergency services like fire service etc.

ObelixtheGaul · 30/12/2025 14:02

Itsmetheflamingo · 30/12/2025 13:45

Btw I don’t know why your post was deleted and didn’t find it in the slightest unacceptable

I'd imagine because I said a poster could 'fuck off' which I probably shouldn't have done, but I am rather fed up with 'teeny-tinies' and the apparent acceptability of stating that those who say they eat plenty must be either lying or too stupid to know what their intake is.

For the record, I'm now on the high end of the weight range, bordering on overweight according to guidelines, because I am now post menopausal and much less physically active. I'm still not mentally or physically ill and I'm still totally aware of what I eat and how much of it I eat, and would be if I put on the two pounds necessary to make me numerically and statistically overweight. If I posted my height and weight, I bet I'd still get a lot of 'teeny-tinies' style comments, in fact on the weight loss forum there is a petite thread and it has had those type of comments.

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