Losing visceral fat over time is linked to slower brain shrinkage and better cognition in late midlife.
A growing body of research suggests that obesity may be associated with accelerated brain aging, but where fat is stored may be even more important than how much you have. To explore this, researchers followed people for several years to see whether reducing visceral fat, the deep abdominal fat around organs, was tied to better brain health later in life.
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The study included 533 adults - most of them men, with an average age of about 61 - who had previously participated in clinical trials testing how different diets and lifestyle strategies affect body weight and fat distribution. Those trials lasted about 18 to 24 months. Between 5 and 16 years later, the participants underwent detailed testing, including brain and abdominal MRI scans to assess brain structure and fat distribution, along with standard tests of memory and thinking.
- Participants with more visceral fat generally had lower scores on a test of overall thinking ability, particularly among those with higher brain volume measures.
- When the researchers looked at participants with fat measurements taken at three time points (at the start and end of the original trials, and later during this new study), lower long-term exposure to visceral fat was linked to better cognitive and memory scores later in life.
- Participants who lost more visceral fat during the original intervention period tended to have larger total brain volume and gray matter volume (gray matter contains most of the brain's nerve cells and is essential for processing information). In a smaller group with repeated brain scans, those with lower visceral fat showed a lower decline in gray matter and hippocampal (the hippocampus is a key memory center in the brain) measures over time.
The researchers also looked at how visceral fat might affect the brain. Measures of blood sugar control were most strongly linked to later brain changes. In particular, fasting glucose and HbA1c stood out more than cholesterol or common markers of inflammation. This suggests glucose regulation may be an important pathway linking visceral fat to brain health. Visceral fat is strongly associated with insulin resistance, a condition in which the body's cells respond poorly to insulin, leading to higher blood sugar levels over time. Over the long term, these changes can damage blood vessels and reduce blood flow to the brain. Other processes, such as inflammation and weakening of the blood-brain barrier (the system that controls what enters the brain) may also play a role.
Because participants were not randomly assigned after the original trials ended, the study cannot prove that visceral fat loss directly caused the brain benefits. Even so, these findings suggest that where fat is stored may matter more for brain health than body weight alone. In this clip, Dr. Ben Bikman explains the primary causes of insulin resistance and how to reverse it in as little as 90 days.