We are used to thinking of body fat as a single entity. But biology says otherwise: there are at least two different types of fat that function completely differently. One clings to the skin (subcutaneous) – the fat you see and feel. The other, more metabolically severe, sits deep in the abdomen, around the internal organs: the liver, pancreas, intestines. This is visceral fat.
A new, large study that made headlines in the global scientific press found that consistently low levels of this fat – the hidden, internal one – are associated with slower brain aging over the years. It is important to be precise: this is an observational association, not proof of direct causation, but the link was consistent and measurable in repeated brain scans.
Why specifically visceral fat?
Visceral fat differs from subcutaneous fat in several key ways:
- High metabolic activity – it secretes large amounts of biologically active substances.
- Proximity to the liver – via the portal vein, substances from this fat reach the liver directly.
- Source of systemic inflammation – it secretes inflammatory cytokines like TNF-alpha and IL-6, which in turn increase CRP production in the liver – those inflammatory markers involved in inflammaging.
- Impact on hormones and blood sugar – it secretes leptin and resistin, and is strongly linked to insulin resistance.
This means: visceral fat is more than passive energy storage. It is a metabolically active tissue that affects blood sugar balance and systemic inflammation in the body, and these in turn are linked to brain health.
The study: 533 participants, follow-up of 5 to 16 years, repeated MRI
The team from Ben-Gurion University, led by Dr. Dafna Pachter and headed by senior researcher Prof. Iris Shai, uniquely analyzed long-term data. Key methodology:
- 533 participants, average age around 61, most (about 86%) men.
- Follow-up of 5 to 16 years of participants from four previous controlled dietary trials: DIRECT, CASCADE, CENTRAL, and DIRECT-PLUS.
- Accurate and repeated imaging measurements: abdominal MRI measuring visceral fat volume separately from subcutaneous, and brain MRI measuring the volume of different brain regions over time.
- Cognitive assessment using the MoCA (Montreal Cognitive Assessment) test.
The strength of the study lies precisely in the long and repeated follow-up: not a single snapshot, but a trajectory of visceral fat and brain volumes over years in the same individuals.
The core finding
Participants whose visceral fat level remained low over time (measured as cumulative exposure over baseline, end of intervention, and follow-up) showed:
- Higher MoCA scores – better cognitive function.
- Better preservation of total brain volume and gray matter – the matter containing neuron cell bodies.
- Preservation of hippocampal structure – a key area for memory, measured by an index called the Hippocampal Occupancy Score.
- Slowed expansion of the brain ventricles – ventricular enlargement is an established marker of brain aging and brain volume loss.
An important point: reduction in visceral fat predicted higher brain volumes at follow-up independently of weight loss. That is, those who specifically lost visceral fat gained a brain advantage beyond what could be explained by overall weight loss.
The mechanism: it all goes through blood sugar
The researchers examined which blood markers explain the link between visceral fat and the brain. The finding was clear: fasting blood sugar levels and HbA1c were the only markers that predicted the rate of structural brain change over time. Blood lipid markers and inflammatory markers did not show a similar association in this model.
The implication: the link between visceral fat and brain aging is mediated primarily through blood sugar balance and insulin resistance, not directly and not necessarily through inflammation. This is an observational conclusion, but it focuses the practical target: blood sugar control.
How to measure visceral fat?
Three methods, from simple to complex:
- Waist-to-Hip Ratio: waist circumference divided by hip circumference. Men above 0.9 and women above 0.85 = increased risk.
- Waist circumference: Men over 102 cm, women over 88 cm = risk.
- DEXA or MRI: Accurate measurement of visceral fat volume. Available through an advanced family doctor or weight specialist.
The practical solution
The practical message from the study is that sustained reduction of visceral fat, regardless of the type of diet and independent of overall weight loss, is associated with preserving the brain. Visceral fat responds well to a combination of balanced nutrition, physical activity, and sleep. Here are the established factors:
1. Mediterranean diet
Olive oil, vegetables, legumes, fatty fish, nuts. The Mediterranean dietary pattern has been linked over the years to reduced visceral fat and metabolic improvement, and it is the basis in most of the trials included in the study.
2. Moderate-intensity aerobic training
Brisk walking, cycling, swimming – about 150 minutes per week. Visceral fat responds well to consistent aerobic activity.
3. Resistance training twice a week
Not just for building muscle – muscle is a metabolic organ. It requires energy and improves insulin sensitivity, which supports blood sugar balance and reduces visceral fat accumulation.
4. Quality sleep
Less than 6 hours of sleep per night increases visceral fat accumulation through effects on cortisol and insulin. 7-8 quality hours are fundamental.
What doesn't work
It is also important to warn against what won't work:
- Abdominal exercises – do not help reduce visceral fat. "Spot reduction" is a myth.
- Extreme diets – cause muscle loss and rapid regain.
- "Fat-burning" supplements – no solid evidence for most.
- One-time solutions – the study emphasizes the value of a consistently low level over years, not a temporary drop.
The simple summary
If the fat on your belly looks soft and pinchable, it is partly subcutaneous. If it is hard and protrudes forward, it is visceral. The hard belly is a problem – not just for blood sugar balance, but also linked to your brain health. Maintaining a low level of visceral fat over time, through a Mediterranean diet, balanced physical activity, and good sleep, was associated in the study with slower brain aging – and especially through improved blood sugar balance.
This may be the intervention with the best effort-to-benefit ratio in any anti-aging field: requires no medications, not expensive, not extreme, and with results measurable in the brain through scans.
References:
Pachter D., Shai I. et al., Nature Communications (2026): Sustained visceral fat loss is associated with attenuated brain atrophy and improved cognitive function in late midlife
Ben-Gurion University: Abdominal Fat Reduction Slows Brain Aging
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