Anul strolled into her doctor’s office, her bag slung casually over her shoulder and her favourite sneakers making a faint squeak on the tile floor. At 35, she felt pretty good about herself. Yes, work was stressful sometimes, and maybe she indulged in a little too much alcohol on the weekends, but overall? She felt fine.
The nurse guided her through the usual routine. Height? Check. Weight? Check. BMI? “24,” the nurse announced with a smile, jotting it down on the clipboard. Anul sat down in the chilly exam room, scrolling through her phone while waiting for her doctor.
When he walked in, it was the same old doctor she had been seeing for years. He glanced at her chart and gave her an approving nod. “BMI’s right in the normal range—great work, Anul! Keep it up.”
Anul smiled, feeling a little smug. "Guess all those after-dinner walks are paying off," she thought.
But here’s the problem: that shiny approval? It wasn’t telling the whole story.
Underneath Anul’s "normal" BMI was something sinister—hidden fat, wrapped tightly around her internal organs like a silent echo of death. This isn’t the kind of fat you pinch on your hips or see in the mirror; this is visceral fat, and it’s sneaky because you cant see it with your eyes. Despite her doctor’s thumbs-up, Anul was actually at a much higher risk for serious health problems like diabetes and heart disease.
The irony? BMI—a tool the healthcare world heavily relies on—completely missed it. And Anul, like so many others, was left believing that her health was in excellent shape.
This isn’t just Anul’s story. It’s a reality for many other people, especially those from ethnic backgrounds where fat distribution works differently. South Asians like Anul, for instance, are more prone to carrying this dangerous belly fat—even when their BMI looks “perfectly healthy.”
So, why is BMI so bad at spotting these risks?
Where your body stores fat has a profound impact on your overall health. BMI only gives a rough estimate of body weight relative to height but says nothing about where that weight is distributed. This is crucial because not all fat is created equal.
Let’s go back to Anul. As a South Asian woman, her body naturally tends to store more fat around the abdomen, even at lower BMIs. Research shows that people of South Asian descent face higher risks of diabetes and heart disease at lower BMIs compared to individuals of European descent.
BMI also fails to consider age and sex, both of which significantly influence body composition and health risks.
Now consider another story. Meet Daniel, a 28-year-old African-American bodybuilder. His BMI is 30, classifying him as "obese." Yet Daniel’s body fat percentage is low, his blood pressure and cholesterol levels are perfect, and his cardiovascular health is excellent.
Contrast this with Kate, a 40-year-old with a BMI of 22. She leads a sedentary lifestyle, eats a poor diet, and has high cholesterol and elevated blood sugar levels. Despite her "normal" BMI, Kate’s health risks are far greater than Daniel’s.
These examples highlight another flaw in BMI: it doesn’t measure overall health, fitness, or lifestyle habits. This goes to say that not everyone who is “obese” is in poor metabolic health and not everyone who has a “normal BMI” is in excellent metabolic health. There are other parameters that are need to be considered.
Fat distribution—and the ethnic, age, and sex-based differences that influence it—play a vital role in health. While BMI remains a quick and easy tool for assessing weight in populations, it falls short for individuals like Amara, Daniel, and Kate.
Your health is not just a number. It’s a complex interaction of factors, including where you store fat, your muscle mass, your fitness level, and your unique genetic background. By shifting our focus to more personalized and accurate measures, we can paint a fuller picture of what it truly means to be healthy.
