May 5, 2026, 12:01 pm | Read time: 6 minutes
A link between obesity and health risks is well-documented. Less clear until now was the role fat distribution in the body plays for the brain. An international long-term study now shows: Apparently, it’s not just body weight alone that’s crucial, but especially the so-called visceral belly fat. A long-term reduction of this “inner” fat seems to protect the organ in the head: According to the study, it is associated with less cognitive decline.
The Known Dangers of Visceral Fat
The medical term “visceral fat” refers to fat that lies deep in the abdominal cavity and surrounds the internal organs. Colloquially, it is also referred to as inner belly fat. It differs significantly from subcutaneous fat tissue, which appears as visible “love handles.”
As internist Dr. Matthias Riedl explained to FITBOOK in previous articles on the topic, visceral fat is metabolically active and acts like an inflammation-promoting gland. It releases messengers that drive inflammatory processes in the body. According to the doctor, this can strain the cardiovascular system over time and thus promote the development of arteriosclerosis.
But that’s not all. The subtle inflammatory processes triggered by inner belly fat can also affect the brain, warns Dr. Riedl. The result can be an increased risk of cognitive decline up to dementia. How strong this connection actually is and what role visceral fat plays in brain health in the long term has now been examined more closely by an international long-term study.1
Study Examines Impact of Visceral Fat on the Brain
The study was conducted by an international research team led by Ben-Gurion University in Negev; scientists from Reichman and Harvard University were also involved. Against the backdrop of the known health risks of belly fat, the team investigated whether a long-term reduction of visceral fat is associated with less brain atrophy (loss of brain volume) and better cognitive performance.
The analysis is based on data from the Follow-Interventions-Trials (FIT) project, which combines several previous lifestyle intervention studies. For the current follow-up, researchers recruited 533 participants from four of these randomized studies again–between five and 16 years after the original interventions were completed.
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Details of the Study
The research team conducted magnetic resonance imaging (MRI) on the subjects. With these examinations, they were able to detail both the belly fat and the condition of the brain. Additionally, they assessed the cognitive performance of participants using the Montreal Cognitive Assessment (MoCA), a standardized test for evaluating memory, attention, and thinking ability.
To capture the long-term burden of visceral fat, scientists used a specific measure: the so-called “area under the curve.” This considers both the level of fat values and their duration over the entire observation period, from the start of the intervention to the follow-up. Various metabolic parameters (such as blood sugar levels, blood fats, and inflammation markers) were also included in the analysis to investigate possible connections with changes in the brain.
Results
The evaluation shows a clear connection between visceral fat and brain health over many years. For example, participants with less “inner belly fat” achieved better results in the MoCA, indicating higher cognitive performance.
Notably, participants who lost visceral fat during the original intervention had a larger brain volume years later–even if they didn’t lose more weight overall. Researchers conclude that targeted reduction of belly fat is of particular importance.
In a subgroup of participants with three MRI measurements, it was also shown that less visceral fat over the years was associated with a slower decline in brain volume. This connection did not occur with subcutaneous fat tissue–the effect was apparently specific to visceral fat. Another significant finding: Improvements in blood sugar control were more strongly associated with positive changes in the brain than changes in blood fats or inflammation values.
Study Author Assesses the Results for FITBOOK
Study author Dr. Dafna Prachter makes it clear in conversation with FITBOOK that visceral fat (VAT) is far more than just a marker for poor metabolic condition. It is “a metabolically active organ” that actively drives systemic dysfunctions and aging processes. Accordingly, VAT must be understood not only as a side effect but as a causal risk factor.
A key result of the study is particularly noteworthy: A lower burden of visceral fat was associated with better preservation of brain structure and long-term stable cognitive performance–independent of body weight or BMI changes. This connection could not be demonstrated for other fat deposits, such as subcutaneous fat, which “suggests a specific, unique mechanism of visceral fat.”
Blood Sugar as a Decisive Factor
Blood sugar also presents a clearer picture than other metabolic parameters. Especially fasting glucose and HbA1c values proved crucial: They were most strongly associated with the speed of structural brain changes. Good blood sugar control was linked to slowed brain atrophy. Other markers–such as blood fats or inflammation values–did not show comparable significance in this study.
Another important point is the long-term perspective. According to the researchers, the data speaks for a clear dose-response relationship: “The lower the cumulative burden of visceral fat over the years, the better brain volume and cognitive function are preserved.” Particularly relevant is not only the long-term course but also early changes: A targeted reduction of visceral fat within the first 18 months already predicted better brain health after five and even ten years–regardless of whether weight was regained later. Whether there is a specific “time window” in which already incurred damage can still be reversed remains open according to the lead author and needs further investigation.
Dr. Prachter formulates the study’s essence clearly: It’s not primarily about how many pounds are lost, but “what type of tissue is reduced.” In other words, successful weight reduction is primarily a qualitative question.
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Possible Significance of the Study
Lifestyle measures that–such as through diet and exercise–specifically target the reduction of visceral fat could thus not “only” lower the risk of metabolic diseases but also preserve mental performance.
The results suggest that blood sugar control could be a possible mechanism through which visceral fat affects brain health. A stable metabolic state thus seems to play an important role in maintaining cognitive performance. For middle-aged and older adults, these insights could help derive more targeted strategies for preventing cognitive impairments.
Limitations
The consistent results across various analyses are a strong indication of the importance of visceral fat for brain health. However, the study’s limitations should also be noted.
First, regarding the participant pool. With about 86 percent of participants being male, the results may not be transferable to women. Additionally, participants had already taken part in lifestyle studies. They may thus differ from the general population in important characteristics, such as motivation or health awareness.
Furthermore, the follow-up is an observational analysis. While connections can be shown, clear cause-effect relationships cannot be established. Even though various metabolic parameters were considered, not all possible influencing factors can be completely excluded.