Before I break down what exactly these AI body scans can (and cannot) tell you, know that this is not some takedown of AI tools being used by radiologists to spot cancer from a CT scan. What I’m focusing on here is all the false advertising for consumers like me, people naturally drawn to the shiniest tools to understand every little thing about their bodies. But before I build my health decisions around a number on a screen, I have to wonder about the gap between what these tools promise and what they actually deliver.
At the serious end sits the DEXA scan (Dual-Energy X-ray Absorptiometry). Originally developed to measure bone density, DEXA uses two low-dose X-ray beams to distinguish between bone, fat, and lean tissue with genuine precision. It can identify visceral fat (the dangerous kind that accumulates around organs), regional fat distribution, and bone density. A single session might cost between $40 and $300 out-of-pocket, depending on where you go and whether any insurance applies. A company like BodySpec, for instance, has built businesses around making DEXA more accessible, performing around a thousand scans a day and building what it describes as the “largest proprietary DEXA dataset” in the world.
Then, at the bottom of the technical hierarchy, sit the phone camera apps. Translating a 2D image into a body fat percentage or visceral fat estimate requires assumptions that are generous at best. These apps may be useful as very rough awareness tools, but so is a photograph.
Another note on "AI" in this context
In consumer devices, "AI" most often means that an algorithm has been trained on a dataset to estimate body composition. But the AI is only as good as the underlying measurement, and those underlying measurements might not be accurate in the first place.
“I had two people with similar scan results, but very different metabolic health once labs were checked,” says Dr. Raymond Douglas, a board-certified oculoplastic surgeon and professor at Cedars-Sinai Hospital in Los Angeles. “And if you're making lifestyle choices based on a scan number alone, you may be fixing the wrong problem."
Perhaps no feature of these AI scanners is more aggressively marketed than "biological age." The marketing angle makes sense: What if you find out your body is actually half your age on paper? It’s no mystery how this number has a way of inspiring either relief or dread, and it often inspires purchases.
What body scans are actually good for
One way to approach all this is to think of body scans as a tool to track trends over time, rather than expecting to have your world rocked from a single session. “Muscle trending up, visceral fat trending down—those are worth paying attention to,” Douglas says. “The mistake most people make is treating a single session like a full medical workup."
"A DEXA scan provides a much clearer picture of what is actually happening in your body by measuring body fat percentage by area, lean mass, bone density, and visceral fat,” says Elaine Shi, CEO and co-founder of BodySpec. “It moves us away from guessing based on proxies like BMI—which is outdated and doesn't represent diverse populations—and allows us to make decisions based on clinical-grade insights." For example, Shi says people taking GLP-1 medications for weight loss can lose a significant proportion of their reduction in lean muscle mass rather than fat, which could point to a metabolic problem that would be invisible on a regular scale.
"Treat the scan as an awareness tool, then combine it with blood tests, blood markers of inflammation, and lifestyle habits to draw conclusions," says Douglas. You should also be especially skeptical of biological age scores. A single number generated by comparing your data to population averages on a given day is not a substantial medical insight. And when you see an ad for a phone camera app that claims to measure your visceral fat with AI, ask what the underlying measurement is. If there is no good answer (which there won’t be from a 2D image), the so-called AI has nothing real to work with.
The bottom line
At the end of the day, snake oil will always thrive in the wellness industry. These days, every snake oil salesman under the sun knows to slap on the term "AI-powered" to add authoritative language to imperfect products. Before you spend hundreds of dollars on a body scan (or waste your time and energy with a phone app), consider the limitations of these readings—and be honest about what exactly you’re trying to discover here. A scan that cannot distinguish between muscle and retained water, whose biological age score shifts five years with poor sleep, and whose readings vary with what you ate for lunch might not be giving you the answers about your body that you crave.
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