Fit, Fat, and What’s Wrong with BMI

I’d like us to ditch all talk of BMI as a meaningful measure when it comes to individuals. And please don’t say it’s better than weight because it’s just weight + height taken into account. So  insofar as weight is a problematic measure and BMI relies on weight, so too is BMI problematic. I’ve long loved Kate Harding’s project BMI Illustrated over at Shapely Prose. She describes it this way, “I put together a slideshow to demonstrate just how ridiculous the BMI standards are.” This isn’t to deny that BMI talk is useful about populations and big picture trends, it’s just that I think it’s misleading and harmful when it comes to individuals.

Lots of thin people are falsely reassured by their BMI, while lots of people with BMIs  in the overweight/obese categories might be worrying with no good reason. Fit and fat are linked but not in the ways most people think. I worry that lots of fat people don’t exercise because they worry what people will think especially if you exercise and don’t get any smaller. Yet fat and fit people can be very healthy.  “People can be obese yet physically healthy and fit and at no greater risk of heart disease or cancer than normal weight people, say researchers.The key is being “metabolically fit”, meaning no high blood pressure, cholesterol or raised blood sugar, and exercising, according to experts. Looking at data from over 43,000 US people they found that being overweight per se did not pose a big health risk.” reports the BBC.

I love my family doctor who cheered me up immensely when she looked at my chart and said, “This is the part of the visit when, given your weight, I should warn you about the health problems associated with overweight and obesity. However, given that you’ve got low to normal blood pressure, no sugar issues, and the best ratio of good to bad cholesterol we’ve ever seen at this clinic, I can’t in good conscience do that. You’re extremely healthy. Whatever you’re doing, keep doing it.”

A few years ago I tried Weight Watchers–for probably the 6th time in my life, will I never learn?–and I was shocked at their weight range for my height. Weights I haven’t seen since Grade 6. And to give you some perspective they were also weights I never weighed even when at 5’7 I wore size 8 clothing.  The so called “healthy” or “normal” weight range for me has never seemed plausible. I had an interesting experience recently. This summer I was measured in the BodPod at the Fowler Kennedy Sports Medicine Clinic which tells you exactly how much of your body is fat and how much is muscle, bone etc. I was happy to see that to weigh what Weight Watchers thought of as my ideal, I’d be allowed a mere 20 lbs of body fat. I won’t discuss exact weights today but I will tell you that I’m 122 lbs not fat. It’s my goal as part of my ‘fittest at fifty’ plan to improve my ratio of lean body mass. You can read more about the difference between the BMI approach and the lean body mass approach here. I plan to both develop my muscles and lose some body fat. I’d also like to lose pounds in absolute numbers too, mostly though to make running easier on my joints and to make it easier to get up hills faster on the bike! Hill climbing on the bike is all about power to weight ratio and so I’ll never be a climber but I hate to get dropped on hills on a regular basis. According to BMI, I’ll likely always be overweight or obese and I’ve made my peace with that. (I’ll write more about my ambivalence around ‘fat’ as a label for me later.)

Marc Perry notes in Get Lean that according to BMI most American football players count as obese. So too do many Olympic athletes. There is list here of all of the Gold medal athletes from the 2004 Olympics in Athens who count as overweight or obese according to BMI. We need to change our image of what athletes look like. Usually they don’t look like fitness models. See Howard Schatz and Beverly Ornstein: The Different Body Types of Olympic Athletes.

About Sam B

Philosopher, feminist, parent, and cyclist!

27 thoughts on “Fit, Fat, and What’s Wrong with BMI

  1. […] to being my fittest ever by the time I’m fifty with some hard data. I agree with Samantha that weight alone is not a good measure of where things stand with a person health-wise. Neither is BMI, for reasons Samantha has also […]

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  2. […] First let’s remember that fat and fit are not polar opposites. As we know, people can be overweight (by BMI and even body fat percentage standards) and still be fit on other m… […]

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  3. […] and in theory that’s doable. Not without ditching some muscle these days. As I mentioned in an earlier post I’m currently 122 lbs of lean muscle and […]

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  4. […] I detailed in Fat, Fat, and What’s Wrong with BMI I’m a bit of a healthy living rock star. Yes, I’m significantly overweight but I have […]

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  5. […] Sometimes I want to use different language–I’m big and strong, not obese (a medical term, based on BMI) but at other times I want people to realize that when they’re talking about obesity I’m part of the story. So too of course are all the Olympic athletes who count as obese. […]

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  6. […] 8, I’m not in their range for my height. I’m too muscular. I feel vindicated now after my visit to the Bod Pod which measures your per cent body fat. I’m almost out of the WW range for my height with 0% […]

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  7. […] It sounds like the dreaded skinny face only happens to Krista when she’s at her very leanest.  The sad part for me is that it happens first. Luckily I can live with the wrinkles if I get to go up hills faster and keep my hips, knees, and ankles happy for another thirty years or more. That’s the reason why I’d like to be leaner even though it’s clear to me that being fat and fit are perfectly consistent. […]

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  8. […] at my thinnest. Given my 122 lb base of muscle and bone, I’ll always be overweight. Which is, I’ve argued here, part of the problem with weight and BMI as measures of anything […]

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  9. […] to mean simply the way we eat on a regular basis.  We talk a lot on our blog about why weight loss alone is not a great measure of fitness and why we’re not big fans of dieting. Also here and […]

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  10. […] in Ferriss’ book has convinced me to revisit it. And I agree with him that body weight and BMI are not useful measures, and that body composition (ratio of fat to lean mass) gives us more useful […]

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  11. […] our lives, and are trying to champion in the blog, is to revise our visions of success.  Sam has a great post that explains why body weight and even BMI have been shown to be poor measures of fitness and […]

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  12. […] used to be seen as a better health indicator than body weight alone,  it’s now routine to question the merits of BMI. Where restrictive dieting coupled with exercise used to be (and perhaps still is) the main […]

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  13. […] to reconsider the claim that there aren’t lots and lots of fit and fat people. Recall my post Fit, Fat, and What’s Wrong with BMI in which I talked about the number of Olympic athletes who are overweight or obese using BMI as a […]

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  14. […] of ‘health’ and ‘healthy.’ Indeed I refer to my own health in this post here, though I’m also ambivalent about the label ‘fat’ and I have plans to get […]

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  15. […] has blogged quite a bit about the potential to be both fit and, by the standards of most charts, overweight. […]

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  16. […] seen in past posts that the assumption that people who are larger than average are unhealthy or unfit is false.  […]

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  17. […] premise one is questionable but that’s been the subject of a few posts. See here and here and here and […]

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  18. electropurple says:

    You are an absolute star for writing this, i run my head against a brick wall every other day trying to explain this to people when they ask why I’m so concerned with eating healthily and exercising without fail ” but you are tiny!” they say and yes i do have a small frame and a perfect BMI, but that doesnt tell you very much about how well i cover up my fat. I have skinny arms and legs but central obesity and am on the higher side of the average bodyfat percentage which only a proper bodyfat test and removal of all clothing reveals…. Girls and guys i cannot stress more how little weight on a scale means unless your’e on the extreme side of things. If I add 5 kgs to the scale in the next 6 months i couldnt be happier so long as its musle and not fat, thatd likely fix up the loose hangies on the tummy and arms!

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  19. […] leaner, improving my muscle to fat ratio and you can read about my motivation for that here, here, and […]

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  20. […] book, Athlete, have been making the rounds lately. Sam gave a shout-out to Schatz’s photos in her popular post, “Fit, Fat, and What’s Wrong with […]

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  21. […] Sam has done in her post Fit, Fat, and What’s Wrong with BMI?, Freehoff reminds us to ignore BMI. It’s only a meaningful measure for populations, not […]

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  22. […] back when we first started this blog, Sam talked about Fit, Fat, and What’s Wrong with BMI.  We have repeatedly emphasized that weight and fat are not sole determinants of health and […]

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  23. […] blogged before about the way fit and fat can come apart.  We’ve also talked about why thin-shaming is as unacceptable as fat-shaming.  It’s […]

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  24. […] background information for my project on “Weighing In,” I came across this link: Fit, Fat, and What’s Wrong with BMI. It’s run by two people who identify as fat activists, feminists, and […]

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  25. […] people come in all shapes and sizes. We have said a number of times on the blog that it is possible to be both fit and fat. And in any case, let’s be clear. fashion shows are not trying to represent […]

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  26. […] standard for dogs makes it difficult to conduct objective research. This desire for a doggy BMI is troubling because the problems with using BMI as a human health indicator are […]

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