The Study
Decreased brain entropy in the left pallidum is associated with memory impairment in obese individuals: Evidence from resting-state fMRI.
This study looked at people's brains and found that those who are heavier tend to have different brain patterns and worse memory. But it didn't change anyone's weight or do anything to prove that being heavier causes the brain changes — it just noticed they happen together.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
Scientists found that in people with obesity, a part of the brain called the left pallidum shows less complex activity, and this is tied to worse memory — and it’s mostly because of higher body weight.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 544 / 100
Quality score
Snapshots of a population at a single point in time, or descriptions of small groups. Can identify correlations and prevalence, but cannot determine cause and effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — this suggests that higher BMI isn't just a physical issue but may directly affect how well your brain remembers things by changing activity in a key reward region.
- 2Obese people had 0.2227 lower memory score linked to brain entropy changes due to BMI, with a 95% confidence interval of 0.0866 to 0.3658.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Brain research
Year
2025
Authors
Kunpeng Cheng, Jia Hu, Liangping Ni, Qi Xue, Dai Zhang, Ye Zhang, Chunxia Huang, Longsheng Wang
Related Content
Claims (6)
In obese adults, higher body mass index explains the entire connection between lower brain entropy in the left pallidum and worse memory performance.
In adults with obesity, brain regions involved in reward processing and memory show weaker communication patterns, and this weaker communication is linked to lower memory test scores.
In people with obesity, lower brain entropy in the left pallidum is linked to memory impairment, while other brain regions involved in reward processing show no such change.
Adults with obesity have lower neural complexity in a specific brain region called the left pallidum, and this lower complexity is linked to worse memory performance.
People with obesity and type 2 diabetes experience a reduction in cognitive function over time.
In adults with obesity, there is stronger communication between two specific brain regions called the pallidum on both sides, and this stronger communication is linked to poorer memory performance.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.