The Fat Your Scales Cannot Detect: Why Visceral Fat Is the Risk Worth Knowing About

You cannot pinch it, feel it, or see it. Visceral fat is fat stored deep around your organs. It is different from subcutaneous fat, which sits just beneath the skin and is the type of body fat you can usually see or pinch.

Some visceral fat is normal, but carrying too much is associated with a greater risk of insulin resistance, type 2 diabetes, cardiovascular disease and fatty liver disease.

Importantly, you do not have to look overweight to carry excess visceral fat. Someone can have a weight and BMI within the healthy range while still storing more fat around the abdomen than is ideal for their metabolic health.Why visceral fat behaves differently

Visceral fat is not a passive energy store. It continuously releases fatty acids and inflammatory substances directly into the bloodstream, including into the vein that carries blood straight to the liver.

The liver plays a central role in regulating blood sugar and cholesterol. When it is constantly exposed to the signals that visceral fat releases, it begins to work less efficiently. This is one of the main ways visceral fat drives a breakdown in blood sugar control (insulin resistance).

What it is associated with

A raised visceral fat level is often a stronger indicator of metabolic risk than BMI alone. It is linked to type 2 diabetes, heart disease, stroke, high blood pressure, and fatty liver disease. These conditions can develop silently. Raised visceral fat causes no pain and no obvious symptoms, which is exactly why measuring it matters.

The BMI blind spot

BMI is worked out using height and weight alone, so it gives no indication of where fat sits in the body. A person can have a healthy BMI while still carrying a high visceral fat level. This matters more as people get older, because fat tends to move towards the abdomen over time, even when overall weight stays the same.

Equally, someone with a lot of muscle may have a raised BMI while their visceral fat levels are entirely healthy.

How is visceral fat measured?

Because visceral fat sits inside the abdominal cavity, you cannot measure it simply by looking at your weight or BMI.

CT and MRI scans can measure visceral fat directly and are generally regarded as the most precise methods, but they are not normally used simply to monitor body composition.

For everyday health assessment, there are more practical ways to estimate central and visceral fat:

• Waist-to-height ratio: uses your waist measurement as a practical indication of central fat. NICE recommends keeping your waist to less than half your height.
• Body composition analysis: uses bioelectrical impedance to estimate fat, muscle, body water and visceral fat from the way a small electrical signal travels through the body.

These methods are useful for monitoring health and body composition, although they are not the same as directly measuring visceral fat using medical imaging.

What drives visceral fat build-up

• Diet. Sugar, refined carbohydrates, and alcohol are particularly strong drivers. Cutting back on these has a more targeted effect on visceral fat than general calorie restriction alone.
• Physical inactivity. Both aerobic exercise, such as walking, running or cycling, and resistance training, such as weights, reduce visceral fat. Doing both together works better than either on its own.
• Sleep. Regularly getting fewer than six hours of sleep a night is linked to higher visceral fat, regardless of diet and activity levels.
• Stress. A stress hormone called cortisol actively encourages fat storage around the abdomen. Long-term stress is linked to higher visceral fat through well-understood hormonal changes.
• Age and hormones. Men build up visceral fat more easily than women who have not yet been through the menopause. After the menopause, this difference narrows, which is one reason heart and circulation risk (cardiovascular risk) rises for women at this stage.

How to reduce visceral fat

Visceral fat responds well to lifestyle change, often more quickly than fat stored elsewhere in the body.

Diet and alcohol

Regularly consuming more energy than your body needs can contribute to visceral fat accumulation. Diets high in heavily processed foods, refined carbohydrates and free sugars may also make maintaining a healthy body composition more difficult, while alcohol can contribute significant additional calories.

Physical inactivity

Spending little time being physically active is associated with higher levels of abdominal fat. Both aerobic and resistance exercise can help reduce visceral fat.

Sleep

Short sleep has been associated with greater visceral fat accumulation. Regular, sufficient sleep is therefore worth considering alongside diet and physical activity rather than treating body composition as a matter of calories alone.

Age and hormones

Body composition changes naturally with age. Visceral fat tends to increase over time, while hormonal changes around menopause can also shift fat storage towards the abdomen.

Genetics

Genetics can influence where your body is more likely to store fat, meaning two people with similar diets, activity levels and BMIs may have different fat-distribution patterns.

Why tracking it matters

Because visceral fat is invisible from the outside, measurement is the only way to monitor it. Tracking it over time can help show whether lifestyle changes are affecting your body composition.

When you’re ready to check your progress, a Bluecrest health check includes a Body Composition Scan that measures visceral fat alongside body fat percentage, muscle mass, BMI and other key markers. Your personalised report helps you see how these results change over time and highlights anything that may need closer attention.

Book your Bluecrest health check and get a clearer view of what is happening beyond the scales.

This article is for general health information purposes and does not constitute medical advice. If you have concerns about your health assessment results, please speak with a healthcare professional.