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Improved serum leptin and ghrelin following bariatric surgery predict better postoperative cognitive function
Michael L Alosco1, Mary Beth Spitznagel1, Gladys Strain2
1Department of Psychology, Kent State University, Kent, OH, USA.
Journal of Clinical Neurology (Seoul, Korea)
|January 29, 2015
Summary
Bariatric surgery improves cognitive function by positively impacting leptin and ghrelin levels. These hormonal changes, along with weight loss, contribute to enhanced attention and executive function post-surgery.
Area of Science:
- Endocrinology
- Neuroscience
- Bariatric Medicine
Background:
- Obesity is linked to cognitive impairment, potentially due to dysregulated leptin and ghrelin systems.
- Bariatric surgery is known to improve cognitive function, but the underlying mechanisms require further investigation.
Purpose of the Study:
- To investigate the relationship between changes in leptin and ghrelin levels and cognitive function following bariatric surgery.
- To explore the role of these hormones in mediating cognitive improvements after weight loss surgery.
Main Methods:
- Eighty-four patients underwent cognitive testing and provided blood samples for hormone analysis before and 12 months after bariatric surgery.
- Computerized cognitive tests assessed attention and executive function, while serum leptin and ghrelin concentrations were measured after an 8-hour fast.
Main Results:
- Patients showed significant improvements in cognitive function, leptin, and ghrelin levels 12 months post-surgery.
- Decreased leptin and increased ghrelin correlated with better attention and executive function, though these associations were partially mediated by body mass index (BMI) changes.
Conclusions:
- Post-bariatric surgery improvements in leptin and ghrelin contribute to cognitive benefits.
- Potential mechanisms include reduced inflammation and improved glycemic control; further neuroimaging studies are warranted.
- Investigating hormonal effects on brain changes and dementia risk in severe obesity is crucial.
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