The number on your scale wasn't invented by a doctor
Published 2 months ago • 4 min read
The number on your scale wasn't invented by a doctor
Hi Reader,
If you've ever stepped on a scale and let the number decide whether you're allowed to feel okay about yourself today, I want to tell you something most people are never told: that number carries way less authority than it feels like it does. Not because I'm trying to talk you out of what you're feeling, but because the history of where it came from might surprise you.
A client once told me about the index card she kept her own private exchange rate. Two ounces up meant she'd failed for the day and owed herself a longer run and a smaller dinner. Two ounces down meant she'd earned the right to feel okay about herself until the next weigh-in. She read it to me flat, like it was just a fact of life. Nothing left to debate.
If that sounds familiar, you're not alone, and you're not imagining the weight this number carries. It's just that the weight was never earned. It was manufactured piece by piece, over about 150 years, by people who were never thinking about you at all.
BMI was never built to judge a person
The formula behind BMI dates back to 1832, invented by a Belgian statistician named Adolphe Quetelet. He wasn't a doctor. He was trying to describe the "average man" across huge populations not diagnose an individual. His formula sat mostly unused for that purpose for over a hundred years.
For most of that time, the number people actually measured themselves against came from somewhere else entirely: height-and-weight charts published by life insurance companies. Those charts existed to help insurers decide how much to charge someone for a policy not to guide anyone's health. But they succeeded in teaching the public that there was one "ideal" number for their height, and that falling short of it meant something about their worth.
Quetelet's formula wasn't even called BMI until 1972, when a researcher named Ancel Keys renamed it after finding it worked decently well as a population-level estimate. Even he intended it as a screening tool for large groups, not a personal report card. The number didn't become the "gospel" measure we treat it as today until the 1980s and 90s.
The calorie came with a guilt trip built in
Around the same time insurance charts were teaching people to measure themselves against an ideal, a doctor named Lulu Hunt Peters was teaching them something else: that eating could and should be tracked against a daily number. Her 1918 book was the first weight-loss book to become a national bestseller, and she's the reason calorie counting became a household habit.
Here's the part that matters: she built guilt into the calorie from day one. Writing during WWI food shortages, she told readers that carrying extra weight was basically unpatriotic a kind of hoarding. She encouraged women to form neighborhood groups that met weekly to weigh in together, a model that later became the blueprint for Weight Watchers. The calorie was never just a neutral unit of energy. It came with a verdict attached from the very beginning.
The scale used to be entertainment — not a private ritual
The first bathroom scale sold in the U.S. showed up in 1913 as a novelty. By the mid-1930s there were 750,000 coin-operated public scales in drugstores and train stations people weighed themselves for fun, in public. It wasn't until the 1960s that the scale moved into the bathroom and became something private, repeated, first thing every morning.
Then in 1951, a man named Jack LaLanne started the first televised exercise show, aimed at women at home, and it ran for three decades. Checking and working on your body stopped being something you did alone once in a while it became a daily, modeled, expected habit.
None of this was about you
Put it all together: a 19th-century population statistic never meant for individuals, a calorie built with guilt attached on purpose, a scale that moved from public novelty into private daily ritual, and a TV culture that made body-checking a normal part of everyone's morning. That combination is what turned a number designed to describe Belgian population averages into something that can decide, six times a day, whether you're allowed to feel good about yourself.
I'm not telling you this to talk you out of your feelings about the number. I'm telling you because you deserve to know that the authority it holds over you wasn't earned. It wasn't based on your actual health, or your worth as a person. It was built by a statistician, an insurance industry, a diet book author, a scale manufacturer, and a television host none of whom ever met you.
That doesn't erase the feeling. But it might loosen its grip, just a little. Because now you're not being asked to just trust me that the number doesn't matter. You're being handed a fact you were never given.
Here's the thing though — even once you see the history clearly, the number doesn't just disappear. For a lot of people, it just moves. The scale stops being the target and suddenly it's calories, or portion sizes, or a clothing size that has to stay the same no matter what. Same pattern, different number. It's still a way of avoiding a feeling by handing the job to a count instead.
If that shift sounds familiar — in yourself, or in someone you love or support — I put together something to help name it before it takes hold somewhere new. It's called the Numeric Substitution Tracker, and it's built for caregivers and treatment team members to notice when counting has quietly moved from the scale to calories, to portions, to clothing sizes, so it can be caught and named instead of just re-homed.
Three handouts for caregivers supporting a loved one with an eating disorder. Through these brief guides delivered over several days, you’ll gain clarity, reassurance, and a better understanding of your role during meals.
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