Visceral Adiposity Index (VAI) – Meaning & Calculation
The Visceral Adiposity Index (VAI) is a calculated score used to assess visceral fat distribution and cardiometabolic risk. It is derived from body measurements and blood lipid values.
Things worth knowing about "Visceral Adiposity Index"
The Visceral Adiposity Index (VAI) is a calculated score used to assess visceral fat distribution and cardiometabolic risk. It is derived from body measurements and blood lipid values.
What is the Visceral Adiposity Index?
The Visceral Adiposity Index (abbreviated: VAI) is a mathematically derived score that evaluates the function and distribution of visceral adipose tissue in humans. Visceral fat refers to the fat tissue that accumulates in the abdominal cavity around the internal organs. Unlike subcutaneous fat (fat stored beneath the skin), visceral fat is more strongly associated with metabolic diseases and cardiovascular conditions.
The VAI was first described in 2010 by Amato et al. in the journal Obesity. It incorporates both anthropometric parameters (body measurements) and metabolic lipid values from blood tests, and serves as an indirect marker of visceral adiposity and insulin resistance.
How is the VAI Calculated?
The VAI is calculated using four parameters:
- Waist circumference (WC) in centimetres
- Body Mass Index (BMI) in kg/m²
- Triglycerides (TG) in mmol/l
- HDL cholesterol (HDL) in mmol/l
The calculation formulas differ by sex:
Formula for Men
VAI = (WC / 39.68 + (1.88 × BMI)) × (TG / 1.03) × (1.31 / HDL)
Formula for Women
VAI = (WC / 36.58 + (1.89 × BMI)) × (TG / 0.81) × (1.52 / HDL)
A VAI value of 1.0 is considered the reference value in healthy, normal-weight individuals with normal visceral fat distribution. Higher values indicate an increased cardiometabolic risk.
Clinical Relevance
The VAI is a useful tool in clinical practice for estimating the risk of the following conditions:
- Type 2 diabetes mellitus
- Metabolic syndrome
- Cardiovascular diseases (e.g., coronary artery disease, heart attack, stroke)
- Non-alcoholic fatty liver disease (NAFLD)
- Polycystic ovary syndrome (PCOS)
- Insulin resistance
Studies demonstrate that an elevated VAI is independently associated with an increased risk of these conditions, even when BMI is within the normal range. This makes the VAI superior to BMI alone as a risk marker, as it more accurately reflects the quality and function of adipose tissue.
Advantages of the VAI Over Other Measurement Methods
Direct measurement of visceral fat is complex and requires imaging techniques such as MRI or CT scanning. The VAI offers a simple, cost-effective alternative, as it only requires routine blood test parameters and basic body measurements. Compared to other indices such as BMI or waist circumference alone, the VAI has greater predictive accuracy for metabolic diseases.
Reference Values and Interpretation
No universally standardised international cut-off values for the VAI have been established yet, as these may vary across different population groups. The following reference ranges are commonly used in research:
- VAI < 1.0: Low visceral fat risk
- VAI 1.0 – 2.0: Mildly elevated risk
- VAI > 2.0: Significantly elevated cardiometabolic risk
Interpretation should always be made in clinical context and in conjunction with other risk factors.
References
- Amato MC et al. (2010): Visceral Adiposity Index: A Reliable Indicator of Visceral Fat Function Associated with Cardiometabolic Risk. Diabetes Care, 33(4), 920–922.
- Motamed N et al. (2017): Visceral Adiposity Index or Waist Circumference: Which Predicts Metabolic Syndrome Better? A Population-Based Study. Digestive Diseases and Sciences, 62(3), 526–530.
- World Health Organization (WHO): Obesity and overweight. Fact sheet. Available at: https://www.who.int/news-room/fact-sheets/detail/obesity-and-overweight
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