When you think about your body composition, it's easy to focus on weight alone. But the scale doesn't differentiate between fat, muscle, bone or water, nor does it tell you where fat accumulates or what that means for your health. Therefore, if you want to better understand your body, it's not enough to know how much you weigh: you need to know what makes up that weight.
Subcutaneous fat is the fat found just under the skin. It's what you might notice when you pinch your abdomen, thighs, arms, or hips. It's not bad on its own: it performs normal functions such as protecting tissues, cushioning shocks and helping to regulate body temperature. The problem appears when excess body fat is accompanied by a less favorable distribution from the metabolic point of view.
Here a very common question arises: how do you actually measure subcutaneous fat and which method is the most useful? The answer depends on the level of detail you're looking for. There are simple methods, such as the measuring tape or skin folds, and other more advanced methods, such as DEXA, that allow us to obtain a much more complete view of body composition.
Subcutaneous fat is adipose tissue that is located under the skin. It's different from visceral fat, which accumulates deeper in the abdomen and surrounds internal organs. This difference is important because not all fat is associated with the same level of metabolic risk.
Visceral fat is usually more clearly related to disorders such as hypertension, high cholesterol, high glucose, fatty liver, cardiovascular disease and type 2 diabetes. Although subcutaneous fat may increase along with excess total adiposity, it does not have the same metabolic behavior as visceral fat. In fact, some work suggests that, in certain contexts, it may act as a less damaging reservoir than other fatty compartments.
This explains why two people with a similar weight or even with a similar body appearance can have very different metabolic realities. It's not just the amount of fat that matters: it matters where it is and how it relates to muscle mass and other body markers.
There is no single method that is perfect for everyone. Each tool provides different information and has its limitations. The important thing is to know exactly what each one measures and when it may fall short.
The measuring tape is one of the simplest and most accessible methods. The waist circumference can guide a greater accumulation of abdominal fat and help to assess cardiometabolic risk in a basic way. However, it does not make it possible to differentiate precisely between subcutaneous fat and visceral fat.
That's why the measuring tape can be useful as a first step or for general monitoring, but it doesn't provide a complete picture of body composition. It serves to detect trends, not to understand in depth the distribution of adipose tissue.
Skin folds estimate subcutaneous fat by measuring the thickness of several skin and fat folds in specific areas of the body. It is a classic and relatively practical method when done by an experienced professional.
Its main limitation is that it depends a lot on the technique. The accuracy changes depending on the skill of the person doing the measurement and, in addition, in people with greater adiposity it may be less reliable due to limitations of the calibrator itself and the removal of the fold.
In practice, folds can orient over superficial subcutaneous fat, but they should not be interpreted as an exact measurement or equivalent to advanced body analysis techniques.
Bioimpedance is a fast and widespread technique that estimates body composition based on the passage of a low-intensity electrical current. From that measurement, it calculates body water, fat-free mass and fat mass.
Its great advantage is convenience. Its main limitation is that the result may vary depending on the state of hydration, the time of day, recent exercise, body distribution and even other physiological factors. Therefore, although it is useful as an orientation, it does not always provide a sufficiently accurate picture of a specific person.
In comparative studies, bioimpedance and also folds have shown a tendency to underestimate the percentage of body fat compared to DEXA.
DEXA is not limited to estimating total body fat. It allows the analysis of fat mass, lean mass, bone mass and regional distribution, and many systems also allow the estimation of visceral fat. That makes it a much more useful tool when the goal isn't just to get a number, but to understand what's actually going on in the body.
Another important advantage is its precision and its usefulness for tracking over time. In addition, the radiation dose is very low.
In other words, DEXA not only answers the question “how much fat do I have”, but also “how is it distributed”, “how much muscle mass do I have” and “what information can be useful for my health and prevention”.
If the question is strictly technical, skin folds are one of the methods most aimed at estimating superficial subcutaneous fat at specific points on the body. But if the question is which method provides the most useful information about health and body composition, the answer is broader.
In prevention and follow-up, the most valuable thing is usually not just knowing the thickness of a fold, but understanding the whole: total fat mass, regional distribution, muscle mass and possible visceral accumulation. From that perspective, the DEXA offers a much more complete photograph than a measuring tape, bioimpedance or an isolated measurement with folds.
Therefore, the “best method” depends on the objective. Simpler tools may be useful for basic orientation. For more informed health decisions, a technique that allows us to see beyond weight and a general estimate is often preferable.
Here it is important to clarify something important: there is no single “ideal” percentage of subcutaneous fat applicable to all women. The most common thing in clinical and research is to interpret the percentage of total body fat, together with the age, muscle mass, regional distribution and health context of each person.
In a reference cohort measured by DXA, the median total body fat in women was approximately 29.9% between 20 and 29 years old, 36.8% between 30 and 39 years old, 40.0% between 40 and 49 years old and 42.7% between 50 and 59 years old. These data can serve as population guidance, but should not be interpreted as a universal objective or as a diagnosis on their own.
What's really important is what that number means in your case. The same percentage of fat can have different implications depending on muscle mass, the pattern of abdominal distribution or the presence of visceral fat. Therefore, the interpretation must be individual and not limited to an isolated number.
Subcutaneous fat should not be evaluated in a simplistic way. Having body fat is normal and necessary. The problem appears when there is excess adiposity and, above all, when it is accompanied by a distribution that increases metabolic risk.
Available evidence suggests that visceral fat is more closely related to significant metabolic disorders. Subcutaneous fat, although it may increase along with excess total fat, does not usually have the same biological impact as visceral fat. In fact, some studies suggest that, in certain contexts, it can behave like a relatively less harmful reservoir.
Therefore, talking only about “belly fat” can lead to confusion. To understand the real risk, it is important to analyze body composition in more detail and not rely solely on external appearance or total weight.
At TIVEN, we are committed to a more complete vision of body health. Weight alone doesn't explain whether you're gaining fat, losing muscle, or maintaining a favorable body distribution. However, these details can make important differences when it comes to prevention, metabolic health and follow-up.
DEXA analysis allows us to know more precisely fat mass, lean mass, bone mass and body distribution. This helps you make better-informed decisions about nutrition, exercise, healthy aging, and managing risk factors.
In addition, the interpretation of body composition must be done with context. Even between different DEXA systems, there can be technical and calibration differences, so it is essential to have a professional reading and consistent monitoring over time.
Measuring subcutaneous fat can be useful, but understanding full body composition is much more valuable. The measuring tape orients, the folds estimate, the bioimpedance approximates and the DEXA allows for a more accurate and useful photograph for health.
When the goal is to take care of your health, it's not enough to ask yourself how much you weigh. The really important question is: how much fat you have, where is it, how it relates to your muscle mass, and what it means for your metabolic health.
No. Subcutaneous fat is part of the body's normal biology and performs protective and regulatory functions. The problem is not its existence, but rather a global excess of body fat and, especially, a distribution associated with greater metabolic risk.
Subcutaneous fat is under the skin and is what you can notice when pinching certain areas of the body. Visceral fat is deeper, surrounds abdominal organs and is usually more clearly associated with metabolic and cardiovascular disorders.
Skin folds can estimate superficial subcutaneous fat, but if you're looking for a more complete assessment of your body composition and its relationship to health, DEXA provides much more information.
No. They are not interchangeable methods. Bioimpedance can be influenced by hydration, time of day and other factors, while DEXA provides a more accurate and detailed assessment of body composition.
There is no single number that is valid for all of them. The interpretation must be made according to age, muscle mass, fat distribution and clinical context. Population values for DXA change with age, so an isolated figure should never be interpreted without context.
Yes, but the dosage is very low. In a full body DEXA, the exposure described in technical reviews is roughly comparable to a day's natural background radiation.
At TIVEN, we use body composition analysis by DEXA to help you better understand your fat mass, muscle mass and body distribution, with a more useful view for the prevention and monitoring of your health.
Ask for your assessment and find out what's behind your weight.
This content is informational and is not a substitute for an individual assessment by a healthcare professional. The interpretation of body composition must be done in a clinical context, especially if there is a metabolic, cardiovascular or endocrine history.
