Visceral Fat: What It Is, How to Measure It, and How to Reduce It

Not all body fat is created equal. Visceral fat — that which is hidden inside the abdomen, around the liver, pancreas, and intestines — is metabolically active and much more dangerous to health than the subcutaneous fat you can see and touch. The good news is that it responds much more quickly to lifestyle changes.

Visceral Fat vs. Subcutaneous Fat

A lean person can have high visceral fat without it being externally visible — this is the "TOFI" (Thin Outside, Fat Inside) profile, identified as an independent risk factor. Conversely, a person with a visible "belly" may primarily have subcutaneous fat with normal visceral fat levels.

Why Visceral Fat Is Dangerous

Visceral fat is not passive: it secretes biologically active substances that alter systemic metabolism:

• TNF-α and interleukin-6: pro-inflammatory cytokines that damage blood vessels and promote insulin resistance
• Resistin: reduces insulin sensitivity in the liver and muscle
• Reduced adiponectin: the protective anti-inflammatory protein is inversely proportional to visceral fat
• Free fatty acids: released directly into the portal circulation towards the liver, contributing to hepatic steatosis

The practical result: high visceral fat is associated with:

• Type 2 diabetes: +150% risk
• Cardiovascular disease: +100% risk
• Arterial hypertension: +60% risk
• Non-alcoholic fatty liver disease (NAFLD): present in 70% of individuals with high visceral fat
• Cancer (colon, breast, endometrium): increased risk by 30–50%

How to Measure Visceral Fat at Home

1. Waist circumference

The simplest method: measure your waist circumference at the navel level, in the morning on an empty stomach, after a normal exhalation.

Source: International Diabetes Federation, International Obesity Association.

2. Waist-to-hip ratio (WHR)

Measure waist and hips (widest point of the buttocks). The ratio should be < 0.90 in men and < 0.85 in women. A higher WHR indicates central fat distribution ("apple" type) vs. peripheral ("pear" type) — with a greater metabolic risk.

3. BIA bioimpedance scale

Modern body composition monitors calculate visceral fat with a BIA algorithm. The scale is 1–59 (in devices like VitaeChek's Brio 1 Pro):

• 1–9: healthy level
• 10–14: elevated — lifestyle changes recommended
• ≥ 15: very elevated — medical evaluation advised

The advantage over waist circumference alone: the scale quantifies visceral fat, separating it from subcutaneous fat, and allows monitoring its reduction over time — important because waist circumference may not change even when visceral fat decreases (if subcutaneous fat remains stable).

4. DEXA or abdominal CT scan

Gold standard diagnostic, available only in clinics or hospitals. CT scan accurately distinguishes visceral from subcutaneous fat with millimeter precision. Indicated for specific clinical evaluations, not for routine monitoring.

How to Reduce Visceral Fat: Evidence-Based Strategies

1. Moderate caloric deficit (the foundation)

There are no tricks to selectively lose visceral fat without losing overall weight. A deficit of 500 kcal/day results in approximately 0.5 kg/week of total fat loss, and visceral fat is reduced disproportionately more than subcutaneous fat.

2. Regular aerobic activity

Aerobic exercise (brisk walking, jogging, cycling, swimming) is most effective at reducing visceral fat — even without total weight loss. 150–250 minutes of moderate aerobic exercise per week reduce visceral fat by 3–5% in 3 months. This effect is partially independent of caloric deficit.

3. HIIT (High-Intensity Interval Training)

High-intensity interval training produces a 40% greater reduction in visceral fat compared to continuous aerobic exercise for the same amount of time, according to a meta-analysis of 39 studies (British Journal of Sports Medicine 2022). Even 20 minutes of HIIT 3 times a week yields measurable results in 8–12 weeks.

4. Reduce refined carbohydrates and added sugars

High glycemic index carbohydrates (sugars, white bread, sugary drinks) promote hepatic lipogenesis and visceral accumulation. Replacing them with low GI carbohydrates and increasing protein selectively reduces visceral fat even without a total caloric change.

5. Reduce stress and improve sleep

Cortisol — the chronic stress hormone — promotes visceral fat accumulation through direct receptor mechanisms (cortisol receptors are more abundant in visceral adipocytes than in subcutaneous ones). Sleeping 7–8 hours per night reduces basal cortisol levels by 30–40%.

6. Reduce alcohol intake

Alcohol is predominantly metabolized in the liver, which becomes overloaded with acetate — a preferential substrate for visceral triglyceride synthesis. Reducing alcohol consumption to < 1 unit/day has significant effects on reducing visceral fat in 8–12 weeks.

How Quickly Visceral Fat Is Reduced

Visceral fat is the compartment that responds most quickly to diet and exercise:

• 2 weeks of caloric deficit: measurable reductions already with BIA
• 4–6 weeks of combined program (diet + exercise): 1–2 point reduction on the BIA scale
• 3 months of correct lifestyle: 15–25% reduction in total visceral fat in obese subjects

Using the Brio 1 Pro every week allows you to track this reduction in real-time — much more motivating than waiting months to see the number on the scale drop.

Frequently Asked Questions

Can I have high visceral fat with normal weight?

Yes — the TOFI (Thin Outside, Fat Inside) profile. It is particularly common in sedentary people with stable weight who have never engaged in physical activity. BMI and scale alone do not detect it; BIA measurement or waist circumference is needed.

Do abdominal exercises reduce visceral fat?

No — "spot reduction" is a myth debunked by dozens of studies. Abdominal exercises strengthen abdominal muscles but do not selectively reduce fat in that area. Visceral fat reduction occurs with caloric deficit and systemic aerobic activity.