Pancreatic Polypeptide Linked to Anxiety in Obese Men But Not Women
Among NPY-family peptides, only pancreatic polypeptide (PP) showed a moderate association with perceived anxiety in obese men, suggesting sex-specific gut-brain-axis effects on mood.
Quick Facts
What This Study Found
Pancreatic polypeptide (PP) plasma levels showed a moderate association with perceived anxiety specifically in obese men. NPY and PYY were not associated with anxiety, depressiveness, or perceived stress.
Key Numbers
144 patients; PP-anxiety r=0.41 p=0.007 in men; women had higher anxiety (8.13 vs 5.93) and stress (52.62 vs 41.23); no NPY/PYY mood associations
How They Did This
Cross-sectional observational study in 144 obese patients. Measured plasma NPY, PYY, and PP levels. Assessed anxiety, depressiveness, and perceived stress using validated questionnaires. Analyzed associations with sex-stratified statistical models.
Why This Research Matters
Obesity and anxiety commonly co-occur, but the biological link is poorly understood. PP's sex-specific association with anxiety suggests the gut-brain axis may contribute differently to mental health in obese men versus women.
The Bigger Picture
This adds to growing evidence that gut-derived peptides influence brain function and mood, not just appetite. The sex-specific finding aligns with known gender differences in both anxiety disorders and gut hormone regulation.
What This Study Doesn't Tell Us
Cross-sectional — cannot determine causation. Moderate sample size. Only obese participants — may not apply to normal weight. PP-anxiety association was moderate, not strong. Self-reported psychological measures.
Questions This Raises
- ?Does PP directly influence brain anxiety circuits or is it a marker of another process?
- ?Why is the PP-anxiety association sex-specific?
- ?Would PP receptor modulation affect anxiety in obese individuals?
Trust & Context
- Key Stat:
- PP-anxiety link in men only Among three NPY-family peptides, only pancreatic polypeptide showed mood associations, and only in obese men
- Evidence Grade:
- Moderate — adequately powered observational study (n=144) with validated measures, but cross-sectional design limits causal inference.
- Study Age:
- Published in 2020; gut peptide-mood interactions in obesity remain an active research area.
- Original Title:
- Pancreatic Polypeptide but Not Other Members of the Neuropeptide Y Family Shows a Moderate Association With Perceived Anxiety in Obese Men.
- Published In:
- Frontiers in human neuroscience, 14, 578578 (2020)
- Authors:
- Schaper, Selina Johanna, Hofmann, Tobias, Wölk, Ellen, Weibert, Elena, Rose, Matthias, Stengel, Andreas
- Database ID:
- RPEP-05113
Evidence Hierarchy
Watches what happens naturally without intervening.
What do these levels mean? →Frequently Asked Questions
What is pancreatic polypeptide and how does it relate to anxiety?
PP is a hormone released by the pancreas after eating that helps regulate appetite. This study suggests it may also communicate with brain areas involved in anxiety, particularly in obese men, though the mechanism is not yet clear.
Why would gut hormones affect mood differently in men and women?
Men and women differ in gut hormone levels, brain receptor distributions, and stress response systems. These biological differences may cause the same gut signals to produce different psychological effects.
Read More on RethinkPeptides
Cite This Study
https://rethinkpeptides.com/research/RPEP-05113APA
Schaper, Selina Johanna; Hofmann, Tobias; Wölk, Ellen; Weibert, Elena; Rose, Matthias; Stengel, Andreas. (2020). Pancreatic Polypeptide but Not Other Members of the Neuropeptide Y Family Shows a Moderate Association With Perceived Anxiety in Obese Men.. Frontiers in human neuroscience, 14, 578578. https://doi.org/10.3389/fnhum.2020.578578
MLA
Schaper, Selina Johanna, et al. "Pancreatic Polypeptide but Not Other Members of the Neuropeptide Y Family Shows a Moderate Association With Perceived Anxiety in Obese Men.." Frontiers in human neuroscience, 2020. https://doi.org/10.3389/fnhum.2020.578578
RethinkPeptides
RethinkPeptides Research Database. "Pancreatic Polypeptide but Not Other Members of the Neuropep..." RPEP-05113. Retrieved from https://rethinkpeptides.com/research/schaper-2020-pancreatic-polypeptide-but-not
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkPeptides research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.