Most people are losing the WRONG kind of weight — and their scale is hiding it. In this video, Dr. Nestor de la Cruz‑Muñoz explains why traditional weight loss tracking is outdated, misleading, and often harmful. If your doctor is still weighing you and calling that “progress,” you’re getting advice from the dark ages. Body composition analysis (InBody, DEXA) is the modern standard. It shows what actually matters:
If your doctor still weighs you on a scale and calls it progress, you're living in the dark ages of medicine. The scale is a relic. It's a blunt instrument that tells you nothing about what actually is going on inside your body. In 2026, any provider who isn't using body composition analysis is practicing outdated, incomplete care because weight loss isn't the goal. Fat loss is. And without tools like an InBody or DEXA, they're just guessing. They're ra making recommendations blindfolded while your metabolism, muscle mass, and long-term success hang in the balance. If you skip this and keep chasing the number on the scale, you'll likely end up losing the wrong kind of weight. You're going to lose muscle instead of fat. You'll slow down your metabolism. You'll weaken your foundation, and you'll set yourself up for weight regain. You think you're succeeding while your body composition is quietly deteriorating. The tragedy is that it's preventable. And once you understand how body composition works, you'll never look at weight loss the same way again. And you'll realize that the scale alone should never decide your health plan. Look at the difference. Look how much data there is here. First, let me explain why the scale is basically useless on its own. When you step on a scale, it doesn't tell you if you lost fat. Doesn't tell you if you lost muscle. It doesn't tell you if you're retaining water. It doesn't tell you if your metabolism is improving or if it's crashing. It spits out a number, one number. And that number is so misleading it can actually push you in the wrong direction. You can lose weight and get le less healthy. You can gain weight and get more healthy. And you can stay the same weight and make incredible progress, but if you're all you're looking at is at the scale, you're never going to know any of that. And that's why I say scale-based medicine is outdated. It's incomplete. And honestly, it's dangerous. Would you rather have one number or all this data on your side? Now, let's talk about what body composition analysis, like an inbody scan, actually gives you because it's not perfect, but this is where everything changes because you understand what's going on inside you. The body composition scan tells you your percent body fat. This should be anywhere between 10 to 20% for a man and about 18 to 28% for a woman. I've seen it as high as 55%. The higher the percent body fat, the higher the metabolic risk for that patient. And that means higher risk for high blood pressure and heart disease, higher risk for diabetes and the complications of those medical issues such as heart attacks and strokes and even higher risk for 13 different types of obesity related cancers. It also tells you about your skeletal muscle mass and that's where I see a problem especially in patients who've been yo-yo dieting all their lives. If the skeletal muscle mass is low, the patients basil metabolic rate is also low and that means that it's going to be more difficult for them to lose weight and keep it off in the long term. We also need to track this during weight loss to make sure that it's not decreasing significantly. In patients who do well as they're losing weight, they might only lose 15 to 17% lean body mass. But patients who lose weight poorly might lose 25 or more percent in lean body mass. And that's a huge difference at the end of the day. And that makes a difference for the person's metabolism and a huge difference for the chance of regaining weight later. Your visceral fat is another thing that it shows. And this is the fat that collects around the internal organs. This is the fat that causes all the metabolic disease and it's the bad stuff that we want to avoid. This amount of fat goes up when the total amount of fat in the body increases. And these inbody scans can get tell you how much visceral fat you have. These scans also calculate your basil metabolic rate. This is the number of calories that your body burns just from being alive. The higher the number is, the more calories you can eat in a day without gaining weight. The BMR is not the total amount of calories a person can eat, but it's a big chunk of the calories that make up the entire metabolic rate. Your segmental muscle distribution is also something interesting that it shows us. And it shows us where the muscle is on your body, where you have a lot of it, where you don't have much. We can look for asymmetries. We can look for deficiencies and we can work to fix those. That's real data. That's stuff that that actually determines your health, your metabolism, and your long-term success. and more most importantly the risk of regaining weight. So when I look at an inbody scan I'm not guessing. I'm not hoping. I'm not assuming. I'm seeing exactly what's happening inside your body. And once you start using a body composition as your guide, your entire approach to weight loss changes. So here's the part that no one talks about. When you chase the number on the scale, you often lose the wrong kind of weight. Many times I see patients losing muscle and losing muscle is one of the worst things that you can do for your metabolism. When you lose muscle, your basil metabolic rate or your BMR rate drops. Your ability to burn fat decreases. Your risk of weight regain shoots way up. Your insulin resistance gets worse. Your body composition deteriorates and you get weaker overall. So you might look on the scale and think, "Great, I lost 10 pounds." But if eight of those pals were muscle, that's definitely not a win. That's a metabolic disaster. And here's another thing that people don't realize. You can be thin and still be metabolically unhealthy. They call that the skinny fat. If your percent body fat is high and you're not in a good place, even if the scale says you're normal weight, and this is why some skinny people have high blood pressure and get diabetes. And this is why body composition matters. It tells you the truth. Once you start using body composition, the entire treatment plan becomes personalized. We can set protein goals based on your lean mass. I can prescribe exercise based on your segmental deficits. Maybe your legs need more work. Maybe your trunk and your core needs more stability. I can adjust your GLP-1 dosing based on how your muscle is trending, not based on your weight. and I can tailor that beriatric follow-up plan based on whether you're losing fat or losing muscle. We can modify the nutrition plan based on your basil metabolic rate. It becomes precision medicine, not not guessing anymore. It's not like let's see what happens when you try this or just eat less and move more, which is essentially what we're doing. It becomes here's more data, here's what's improving, here's what's not, here's what we're going to do about it. All right, let me give you a few examples just to make it a little bit more clear because this is where people finally get it. In example number one, a patient comes in and they've gained three pounds. The scale says it's a failure. Well, we put them on the body machine, inbody machine, and it's they we find out they gained almost three pounds of muscle. That's a huge win and that's exactly what we want to see. I don't care that the weight went up. Example number two is a patient loses 10 pounds. the scale says it was a success and I put them on the InBody and they lost eight pounds of muscle and two pounds of fat. That's a metabolic nightmare and that's the kind of weight loss that leads to weight regain. And I see this all the time when I put patients on meds and they're not doing the right things. Example number three is a patient who doesn't whose weight doesn't change at all and they're trying really hard. The scale says they're stagnant. They haven't moved. Well, when we put them on the InBody, maybe we found they lost fat and gained muscle and that's the best possible outcome that we can see. And that's the progress that keeps the weight off in the long term. And this is why I say if you're not using body composition, you're flying blind. Now, let me talk directly to the providers for a second. If you're making recommendations based solely on the scale, you're practicing with incomplete data. You're making decisions essentially blindfolded and you're guessing about your patients metabolism, their muscle mass, their fat distribution, and their long-term risk. And in any other field of medicine, that would be unacceptable. You wouldn't treat diabetes without checking patients blood sugars. You wouldn't treat hypertension without checking their blood pressures repeatedly. You wouldn't treat anemia without checking the hemoglobin level. So why are we treating obesity without checking body composition? It's time for that to end. Now, let me be clear about what happens if you ignore this video and you keep on relying on the scale. There's a good chance you're going to lose a lot of muscle instead of fat. your metabolism is going to slow down and your weight of your risk of weight regain is going to go up. You're going to think you're doing well while your body composition gets worse. You're going to stay stuck in that cycle of weight loss regain, frustration, and repeat. And each time the body composition numbers get worse and worse. When you spend your life yo-yo dieting, your percent body fat keeps going up. If you were at 40% fat when you first weighed 225 pounds and then lost 50 pounds and regained it this next time when you weighed for uh 225, you at 43% fat. And if that cycle is repeated again and again, the third time with another diet, by the time you return to 225, you're likely 45 to 46% fat. The metabolism keeps getting worse in spite of all your efforts. You'll never understand why and you don't know what happens to lead to long-term success or failure. You're going to keep on chasing the wrong number and you're going to pay the price of it. The future of obesity medicine is simple. Fat loss is the goal. Weight loss was the red herring. Muscle preservation is the foundation and body composition is the road map. Percent body fat becomes the true north. Lean mass becomes your anchor and metabolic rate becomes your guide. Once you understand all this, you're never going to look at weight loss the same way again. So, here's what I want you to do. Stop relying on the scale. Demand body composition. Learn your percent body fat, your muscle, and your metabolic profile. Use real data to guide your decisions. Step out of the dark ages and into modern obesity medicine. Because once you start using body composition, everything changes. your strategy, your results, your metabolism, and your long-term success. Real science, real surgery, real results.