We stepped inside a DEXA center in Paris to experience body composition analysis, the gold standard of precision testing. Here is a recount of the experience, concrete takeaways, and an interview with Jad, founder of Dexascan.fr, entrepreneur, and a triathlete passionate about longevity.
Summary
Weight and BMI tell you almost nothing about your actual health. Even behind a silhouette deemed slim, muscle wasting, early bone fragility, and visceral fat can hide; this is the skinny-fat profile. The DEXA scan measures these three pillars in less than ten minutes. We tested it and met with Jad, the founder of Dexascan.fr, who reveals the surprising results of his first scans in France: nearly half of the people tested lack muscle, and two-thirds of 30-to-40-year-olds present an abnormally low bone density.
The scale minimizes, DEXA measures
At Sogevity, we defend a simple idea: you can only manage what you measure accurately. Yet, the tool most people use to judge their fitness, the scale, is precisely the one that lies the most. It adds up muscle, fat, water, and bone into a single number, without ever telling you how they are distributed. Two people of the same weight and height can have radically different bodies and health risks.
This is the whole value of dual-energy X-ray absorptiometry, or DEXA, which was long reserved for elite athletes and clinical research, and is finally becoming accessible to the public in Europe. The scan precisely distinguishes fat mass (including deep visceral fat), muscle mass region by region, and bone density. These represent the three pillars of healthspan: being sufficiently muscled, avoiding the accumulation of visceral fat, and preserving strong bones. So, we booked an appointment to live the experience from the inside.
Ten minutes on the scan, an action plan at the exit
The experience is surprisingly simple. The scan is painless, requires no effort, and lasts less than ten minutes: you lie down in your underwear, without any metallic items, while a motorized arm sweeps over your body. The X-ray dose is extremely low, equivalent to about two days of natural background radiation exposure.
But what sets a real DEXA experience apart from a simple measurement is what happens next. In the center we visited, the scan comes with a comprehensive report analyzed through a longevity lens, including body composition age, bone, muscle, and fat scores; an on-site explanation of the results with a specialist, and the possibility of subsequent exchanges with a nutritionist and a fitness coach. Raw data is only valuable if it translates into concrete decisions.
Meeting with Jad, founder of Dexascan.fr
Behind the platform lies a deeply personal journey. Jad is an entrepreneur and an Ironman triathlete who has been immersed in longevity research for several years. It was while trying to get his own scan that he discovered a gap that needed filling in France.
Sogevity: How did this project come to life, and what is your background?
Jad: I have been a triathlete for three or four years, competing in Ironman formats, I actually just completed one last weekend. For the past five years, I have been doing a lot of research on everything related to longevity. Today, everyone is starting to talk about it in Paris, but a few years ago, it was mostly present on Anglo-Saxon networks. I read extensively on the subject and wanted to apply these principles to myself. Many of these experts talked about the DEXA scan. I wanted to do it in France and found a center in Paris that offered it. When I went there, they explained to me that the center was about to close: their machine was fifteen years old, and they did not intend to renew it. I told myself that if they closed, there would be almost nothing left in France. That is when I launched the business.
But beyond the entrepreneurial challenge and my athletic practice, there is another motivation, one that is much more personal and intimate, which is close to my heart: my mother’s story.
She had a fall at the age of 58. A minor fall. Yet, she broke both of her wrists and both of her arms. After a bone density test, we learned that she has severe osteoporosis. Since then, she no longer dares to ride a bicycle.
This is one of the reasons why I wanted to get a DEXA scan for myself and evaluate my bones. But it is also a primary reason why it is so important to me to make this technology accessible to the general public. If my mother had done a DEXA scan when she was 30, she could have easily detected the early warning signs, strengthened her bones, and avoided reaching osteopenia. It is unfair not to inform people about the existence of this technology when it is well-developed in other countries, like the UK, Australia, the US, and others.
Sogevity: What is the ambition behind the Dexascan platform?
Jad: After building the project, my goal is for Dexascan to become somewhat like the Doctolib of DEXA. I have dexascan.fr, but also versions for Italy, Spain, and Belgium. The idea is that anyone in Europe can book their scan on a single website and get a standardized result, regardless of the center. A single client portal, the same report format, and the same tracking, so you can follow your progress over time even when traveling.
Sogevity: Did your first scans in France bring any surprises?
Jad: A lot of them. In France, everyone talks about obesity. Yet, what we are observing is almost the exact opposite: people who are too thin. Nearly half of our clients are under-muscled compared to the average. And I should clarify that my reference data relies on 50,000 people. Most of the large body composition databases come from the United States, Australia, or New Zealand, where silhouettes are generally heavier. In France, the people who come to see us are probably already health-conscious, so there is a selection bias. And yet, even among them, half lack muscle. The other surprise concerns bones: between 30 and 40, you are supposed to reach your peak bone density, yet nearly two-thirds of the patients tested in this age group have a very low bone density, sometimes already in osteopenia or osteoporosis, both men and women.
Two identical bodies, two distinct bone destinies
For Jad, the scan reveals what no mirror can show. He gives a striking example of this, which can be clearly visualized on the center’s composition reports:
You can view other real examples of DEXA reports and results to see how this health data is decrypted.
The most telling case is two women with almost identical silhouettes. Both are toned, with an excellent muscle score, a good fat percentage, and the same amount of visceral fat. To the naked eye, there is no difference. Yet, one displays a bone density well above average, while the other, at 32 years old, has the bones of a 60-year-old. The difference? The first lifts heavy weights, while the second cycles and smokes.
Impact sports and weight-bearing exercises build bone; non-impact activities do not. And tobacco causes a loss of bone density. Without a scan, these two women would be convinced they are in the exact same state of health. One is protected for decades, while the other is heading toward early osteoporosis without knowing it.
The same trap exists for men, but with fat. Take two men with the same apparent body fat percentage, around 19%, but one is muscled and the other hides heavy visceral fat. This is the skinny-fat profile: slim in appearance, but a metabolic risk in reality. Visceral fat is not measured in kilograms, but in hundreds of grams, and it is the one that triggers inflammation, insulin resistance, and cardiovascular issues. Muscle, on the other hand, acts as a buffer: when there is enough of it, it directs fat toward the limbs rather than the organs.
The body fat percentage trap
This point deserves a closer look, as it affects everyone who owns a smart scale. Body fat percentage can be misleading. It is merely a ratio: the weight of fat divided by total mass. If you have very little fat but also very little muscle, the ratio looks excellent, even though you are in a deficit on both sides.
The example shared on-site is edifying: a client with an extremely lean silhouette, with a 17% body fat percentage worthy of an athlete, but all red flags were up, including under-musculation, low bone density, and a combined fat deficit. Even more striking, a 26-year-old weightlifter who came from Switzerland, referred by her doctor: her body fat percentage had dropped so low that she had lost her period, and the scan was used to measure the impact on her bones, which fortunately is still reversible at her age. The lesson is clear: a “beautiful” fat percentage can mask genuine undernutrition, and this is precisely what the bioelectrical impedance of scales cannot detect.
What the experience taught us?
Three key takeaways stand out from this visit.
- Composition matters more than weight. Muscle, visceral fat, and bone density tell a story that the scale completely ignores.
- Muscle and bone are longevity investments. Impact sports and resistance training, with squats and deadlifts leading the way, build a bone capital that protects you for decades, while muscle provides metabolic protection by serving as a buffer against visceral fat.
- Some reassuring signs can be deceptive. A well-maintained lifestyle, “normal” blood tests, or a slim silhouette do not guarantee that everything is fine on the inside. Magnesium, for instance, can be deficient, especially in endurance athletes who can lose a lot of it through hours of sweating, even when blood tests come back normal, because the body maintains a stable blood magnesium level by drawing from the bones.
The common thread of this experience is crystal clear, and it is exactly what Sogevity stands for: replacing the approximations of the mirror and the scale with objective data, then transforming it into concrete decisions. A flaw detected early is not a fatality; it is a starting point. For anything related to hormones, deficiencies, or supplementation, the guidance of a healthcare professional remains absolutely essential.
Practical information
The center visited, Performance & Beyond, is located at 9 Voie de la Pyramide, 92800 Puteaux (La Défense). Bookings and sample reports are available on dexascan.fr. The platform notably offers a “10% cap ou pas cap” challenge: a pack of two scans with a full refund if the goal of a 10-point variation is achieved within six months.
Partner code: The Sogevity code can be applied via dedicated links for automatic offer activation. The Sogevity partner code grants access to dedicated offers: https://dexascan.fr/longevity
The DEXA scan offered here is part of a wellness and performance approach, without any medical purpose or diagnosis. For any medical advice, please consult a healthcare professional.
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