A Body Mass Index (BMI) reading can fall within the normal range and still lead to serious health risks. Many people only find out during a routine check-up or blood test, when results show high blood sugar or high cholesterol.
This happens because BMI cannot tell the difference between fat stored just under the skin and fat stored deep around the organs. That deeper fat, known as visceral fat, is the kind that carries the greater health risk, and it can be present in someone whose weight looks completely normal.
This guide explains the difference between the two, why BMI alone does not always give the full picture, and what simple measures can tell you more about your health
Body mass index, or BMI, is a simple number you get by entering your height and weight into any free online calculator. It is designed to place people into broad categories such as underweight, normal weight, overweight, or obese.
BMI has been used in healthcare for decades because it is quick to calculate and needs no special equipment.
Two people with the same BMI can look very different on the inside. One may carry more fat around the hips, while the other carries it around the belly, and these two patterns come with very different health risks.
Visceral fat is the kind of fat that is surrounded around organs like the liver, pancreas, and intestines. The other type is subcutaneous fat, which sits just under the skin and is the part you can actually pinch.
Visceral fat is more harmful than subcutaneous fat. A study found that excess visceral fat was strongly linked to high blood pressure and high triglycerides (Lee et al., 2016).
That is part of why two people with the same BMI can end up with very different chances of developing diabetes or heart disease.
This is why doctors usually rely on waist size, waist-to-height ratio, or occasionally a scan, to get a clearer picture.
Both BMI and visceral fat measurement have their place, but neither tells the full story on its own. Here is a quick look at the strengths and weaknesses of each.
| BMI | Visceral fat measurement | |
| How it is measured | Height and weight only | Waist circumference, waist-to-height ratio, body fat machines (found at gyms and wellness centres), or imaging (CT/MRI) |
| Ease of use | Very easy, no special tools needed | Simple estimates are easy; precise measurements need a scan |
| Differentiates fat from muscle | No | Yes |
| Shows where fat is stored | No | Yes |
| Best for | Quick, large-scale screening | Spotting risk that BMI alone can miss |
| Main limitation | Can miss high-risk people whose weight looks normal | Precise measurement isn’t part of routine check-ups |
In practice, the two work best together rather than treating them as competitors. BMI offers a quick starting point, while a simple waist measurement adds the context that BMI is missing.
This combination works particularly well for people whose BMI looks normal but who carry extra weight around the belly.
Since most people will not get a CT or MRI scan as part of routine care, waist size is the most practical way to estimate visceral fat at home or during a regular check-up.
It just needs a flexible measuring tape. Simply wrap it around the middle of the belly, usually around the navel, after breathing out normally, and note the measurement.
For Indian and South Asian populations, a 2023 study placed the cut-off for obesity at 90 cm for men and 80 cm for women, as Indians tend to carry more visceral fat at a given waist size (Sruthi et al., 2023).
Another simple option is the waist-to-height ratio, which you get by dividing your waist measurement by your height. A ratio below 0.5 is generally considered lower risk, while anything above this should be taken seriously.
Both measurements take less than a minute, need no special equipment, and give a far better picture of your health risk than weight or BMI alone.
Visceral fat interferes with several systems in the body at once. This is a big part of why visceral fat is so closely linked to chronic conditions, even in people whose BMI looks normal.
When it comes to diabetes, visceral fat interferes with how cells respond to insulin. Research confirms that obesity is one of the most significant risk factors for the development of type 2 diabetes across all age groups (Chandrasekaran and Weiskirchen, 2024), and visceral fat in particular tends to be more strongly linked to this risk than overall body weight.
The same fat also affects blood pressure regulation and contributes to the kind of chronic, low-grade inflammation linked to blood vessel damage over time.
This is why visceral fat is considered a shared risk factor across diabetes, hypertension, and heart disease.
This is also where regular monitoring becomes useful, not just for weight, but for the broader picture of health risk, which is something Madhavbaug’s PowerMAP technology is designed to track over time.
Reducing visceral fat is not always visible on the weighing scale. These are the markers worth tracking regularly to understand how your body is actually changing:
| What to track | Why it matters |
| Waist size | A direct measure of belly fat reduction is more useful than weight alone |
| Weight | Useful as a trend over time, but it does not show the entire picture |
| Fasting blood sugar | Visceral fat is closely linked to insulin resistance, so improvements here signal real metabolic change |
| Blood pressure | Often improves as belly fat reduces |
| Lipid profile (every 3 months) | Tracks changes in triglycerides, LDL, and HDL as visceral fat comes down |
A monthly check of waist size alongside a quarterly blood test gives a far clearer picture of progress than the weighing scale alone.
Most people avoid getting checked until there is a clear symptom. With visceral fat, by the time a symptom appears, it is often already too late, since the damage it causes to blood vessels, insulin function, and heart health builds over the years.
It is worth speaking to a doctor if any of the following apply:
None of these on their own confirms a problem, but together they are worth investigating rather than waiting for a clearer signal.
Reducing visceral fat is not only about cutting calories. It is about correcting the imbalances that cause fat to build up around the organs in the first place.
Madhavbaug’s Ayurvedic weight loss programme works through a combination of Panchakarma therapies, a structured Ayurvedic diet, herbal formulations, and supervised exercise, all of which work together.
Panchakarma Therapies
It includes different therapies like:
The Swasthyam Diet Kit
Working on nutrition is the foundation of fat reduction. Madhavbaug’s Swasthyam Diet Kit is a 28-day structured Ayurvedic eating plan that focuses on calorie intake, easy-to-digest carbohydrate intake, and balanced macronutrients, all of which are designed to reduce belly fat while nourishing the body.
Where visceral fat co-exists with high blood sugar, the Prameha Diet Kit is used in place of the Swasthyam Kit, which can address both conditions through the same dietary plan.
Herbal Formulations
Madhavbaug’s Ayurvedic approach to belly fat also includes specific herbal medicines that work at the deeper level:
Exercise
Madhavbaug prescribes personalised exercise plans based on each patient’s health condition and physical ability. This includes:
All are prescribed under supervision and adjusted as the patient progresses. The programme brings measurable improvements across blood pressure, cholesterol, blood sugar, and heart risk, all of which are medical benefits of weight loss.
A normal BMI doesn’t always mean you are healthy. If your waist size is increasing or your blood tests have started showing early changes, it is a good idea to get evaluated before these problems progress. Book a consultation with Madhavbaug to understand your health risks and get personalised care.
Which is more accurate, body fat or BMI?
Body fat measurement is more accurate than BMI for assessing health risk, since it can distinguish between fat and muscle and show where fat is stored in the body. BMI uses only height and weight, so a person with more muscle mass can also be wrongly categorised as overweight, while someone with excess belly fat can appear healthy.
What is more harmful, visceral fat or subcutaneous fat?
Visceral fat is definitely more harmful. Subcutaneous fat sits under the skin, but visceral fat deposits around internal organs and actively interferes with insulin function, blood pressure regulation, and cholesterol levels. It is more strongly linked to diabetes, heart disease, and metabolic syndrome than subcutaneous fat.
Is there a better health indicator than BMI?
Yes. Waist size and waist-to-height ratio are both considered stronger indicators of health risk than BMI, since they reflect belly fat distribution rather than overall body size. For Indian and South Asian populations, a waist above 90 cm in men and 80 cm in women signals increased risk regardless of what the BMI shows.
Why does fat collect around the belly and not elsewhere?
Belly fat accumulation is affected by a combination of factors, including stress hormones (particularly cortisol), poor sleep, insulin resistance, and genetics. Cortisol in particular directs fat storage toward the belly area, which is why chronic stress and disrupted sleep are so closely linked to growing waistlines even in people who eat reasonably well.
Is visceral fat reversible?
Yes, and it responds well to lifestyle changes. Consistent changes to diet, movement, and stress management can produce measurable reductions in waist size within weeks, even before much overall weight loss occurs. This is one reason why waist size is a more motivating number to track than the scale during the early stages of any programme.