Study Explores Impact of Body Fat Distribution on Brain Health

Carrying excessive body fat can lead to lasting consequences on the brain and other organs. A recent study indicates that the location of body fat storage may play a significant role in the risk of declining brain health.

Researchers from Xuzhou Medical University in China analyzed MRI scans of 25,997 individuals from a UK health database, with an average age of 55.

Employing a statistical approach known as latent profile analysis, the research team categorized participants into six groups based on their body fat distribution patterns. They then examined the relationship between these patterns and the individuals’ brain scans and cognitive test outcomes.

Findings revealed that, in comparison to the leanest participants, all five other groups exhibited reduced brain volumes and less gray matter, even those with less body fat than the average person.

“Our work utilized MRI’s capability to measure fat in various parts of the body, especially within internal organs, leading to a classification system that is more data-driven than subjective,” explains Kai Liu, a radiologist at the Affiliated Hospital of Xuzhou Medical University.

The team identified two previously unnoticed types of fat distribution: “pancreatic-predominant,” which has higher-than-average fat levels around the pancreas, and “skinny-fat,” where fat is concentrated around certain organs even if overall body weight appears average.

These two profiles were linked to a heightened risk of gray matter decline, white matter lesions, accelerated brain aging, and cognitive decline. They also showed an increased susceptibility to neurological diseases, which encompasses various conditions like anxiety and epilepsy. Notably, there were some distinctions between genders.

The connection between accelerated brain aging was most pronounced in men, while the pancreatic-predominant profile in women was mainly associated with a higher risk of epilepsy, which occurs due to disruptions in the brain’s electrical activity.

While the study reaffirmed that a higher BMI generally corresponds to greater brain decline, it adds to a growing body of evidence suggesting that BMI alone is a rather simplistic measure of obesity that could benefit from additional context.

“The negative effects of increased BMI on brain structure are well-documented,” the researchers noted in their published findings.

“Our derived fat distribution profiles both support this relationship and suggest that fat distribution patterns could act as separate neurodegenerative risk factors.”

It’s crucial to keep in mind that the associations identified in this study are based on a singular snapshot; the relationship between fat distribution and brain health wasn’t analyzed over time, making direct cause-and-effect conclusions elusive.

The study had limitations as well, primarily because participants were predominantly middle-aged and from the UK. Future investigations might delve into larger, more varied populations.

Despite these limitations, the research provides valuable insight into the connection between fat and brain health. This understanding may lead to improved treatments and interventions.

If the identified profiles are confirmed in further studies, it could allow for early warnings for individuals at higher risk of cognitive decline, offering them opportunities to adjust their lifestyles or medications proactively.

“Brain health involves not just the amount of fat one has but also its distribution,” adds Liu.

The study has been published in Radiology.