Body Shape Index
The Body Shape Index (ABSI) combines waist circumference, height, and BMI to quantify how much of a person's body mass is concentrated around the abdomen — beyond what BMI alone predicts. Unlike WHtR or BMI individually, ABSI mathematically isolates the shape component (central versus peripheral body mass). It has been validated as an independent predictor of all-cause mortality and metabolic disease risk.
How Vsense measures it
Vsense estimates ABSI using scan-derived body composition estimates combined with profile data. The standard ABSI formula is: waist circumference / (BMI^(2/3) × height^(1/2)).
How it's scored
Below 7.5: Healthy body shape distribution. 7.5–8.6: Moderate — central fat accumulation is a risk factor. Above 8.6: Elevated — body fat is concentrated centrally (around the abdomen), indicating higher metabolic and cardiovascular risk.
What a high reading means
A high ABSI means your body proportionally stores more fat around the abdomen than expected for your height and weight. This central fat distribution pattern is independently associated with higher metabolic syndrome risk, type 2 diabetes, and cardiovascular mortality — even in people with normal BMI.
What a low reading means
A low ABSI indicates a more evenly distributed or peripheral fat distribution pattern — considered lower risk. People who store fat peripherally (hips, thighs) have consistently better metabolic outcomes than those with central distribution.
How to improve it
Exercise
- Aerobic exercise preferentially reduces central fat — prioritise this over strength training for ABSI improvement
- HIIT has the strongest evidence for targeting abdominal fat distribution
- Maintaining lean muscle mass through resistance training prevents the age-related shift toward central fat accumulation
Diet
- Reduce refined carbohydrates and sugar — these specifically drive central fat accumulation via insulin
- Mediterranean dietary pattern is associated with healthier body fat distribution
- Avoid alcohol — it specifically promotes abdominal fat storage
- Fiber-rich diet (30g+ daily) is associated with less central fat over time
Lifestyle
- Manage chronic stress — cortisol directs fat storage to the abdomen
- Quality sleep is essential — poor sleep causes hormonal changes that promote central fat accumulation
- Avoid smoking — it paradoxically promotes central fat storage despite suppressing appetite
Natural remedies
- Green tea extract and berberine have the most evidence for targeting abdominal fat
- Probiotics (particularly Lactobacillus gasseri) have shown specific reductions in abdominal fat in trials
- Intermittent fasting may have particular benefit for ABSI by reducing visceral fat preferentially
Frequently asked questions
What does ABSI tell me that BMI doesn't?
ABSI isolates your body shape — specifically how much of your mass is centrally located. Two people with identical BMI, height, and weight can have very different ABSI values if one stores fat centrally (higher risk) and the other peripherally (lower risk).
Is ABSI better than waist-to-height ratio?
ABSI and WHtR are complementary. WHtR is simpler and highly practical. ABSI accounts for overall body size (BMI) when isolating the abdominal shape component. Some studies show ABSI is a better mortality predictor; others favour WHtR. Looking at both together gives the most complete picture.
Can genetics affect ABSI?
Yes — body fat distribution is strongly influenced by genetics, sex hormones, and ethnicity. Men and post-menopausal women are more prone to central fat storage. East Asian populations tend to develop metabolic risk at lower central adiposity levels than European populations.
