Adults who trimmed at least 5 percent of their visceral fat, the deep fat wrapped around organs in the abdomen, had roughly four times better odds of improving their HDL cholesterol and about three times better odds of improving their long-term blood sugar control.
That is the headline finding from a three-month dietary intervention in 175 adults with overweight or obesity, published in Frontiers in Endocrinology in June 2025.
The study did not use a heroic weight loss target. Even a modest 5 percent reduction in the deep abdominal fat depot moved several cardiometabolic markers in a favorable direction.
Compared with participants who did not lose visceral fat, those who lost at least 5 percent had 4.19 times greater odds of raising their HDL cholesterol, 3.01 times greater odds of lowering triglycerides, and 2.95 times greater odds of improving HbA1c, a three-month measure of blood sugar.
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Blood pressure, by contrast, did not track meaningfully with visceral fat change in this study.
What visceral fat is, and how to spot it
Visceral fat sits deep in the abdomen around the liver, pancreas and intestines.
It is metabolically active and behaves very differently from the subcutaneous layer you can pinch under the skin, which is one reason belly fat is more dangerous than fat elsewhere on the body.
You cannot see visceral fat directly, but a tape measure gives a rough proxy.
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The American Heart Association flags waist circumference as a warning sign of cardiovascular risk even when BMI looks normal, and standard cutoffs used in US surveillance are 40 inches (102 cm) in men and 35 inches (88 cm) in women.
The plate-plus-fasting approach that was tested
The Frontiers study compared two everyday eating patterns over 12 supervised weeks.
One group followed a healthy plate portion model, splitting each meal into roughly half vegetables, a quarter lean protein and a quarter whole-grain carbohydrate.
The second group followed the same plate model and added two non-consecutive dawn-to-dusk fasting days per week, roughly 13 hours each without food or water.
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Participants were mostly women, with an average age around 34 and starting visceral fat area on the higher end.
Body fat was measured by bioimpedance analysis rather than MRI, which is a limitation the authors flag when comparing to imaging-based work.
A 10-year metabolic legacy
The size of the effect matters because visceral fat loss appears to leave a long tail. In a June 2026 pooled analysis of the CENTRAL and DIRECT-PLUS lifestyle trials, published in Circulation, researchers tracked 366 participants with repeat MRI scans up to 10 years after the original 18-month intervention.
Body weight had returned to baseline for most participants by the final follow-up.
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Waist circumference and the deep abdominal fat depots, however, remained partially lower than at the start.
Each 10 percent drop in visceral fat achieved during the intervention was linked to about 30 percent lower type 2 diabetes risk over the following decade.
The signal is consistent with earlier follow-up work showing that belly fat lost through lifestyle change may keep protecting health for years, even after the weight returns.
What this changes for readers
Neither study replaces medical care, and anyone with elevated blood sugar, cholesterol or blood pressure should discuss a plan with their doctor before restructuring meals or trying fasting.
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But the practical threshold is modest. A 5 percent trim in the deep abdominal depot, achieved with a portion-controlled plate with or without two weekly fasting windows, was enough in the Frontiers study to shift the odds on HDL, triglycerides and HbA1c.
For a rough at-home check, the AHA recommends measuring the waist just above the hip bones at the end of a normal out-breath, with the tape snug but not compressing the skin.
This article is made and published by Mie Hermansen, who may have used AI in the preparation.