The Appetite Neuropeptide NPY Varies by Sex and Menopause Status in Depression, Particularly Affecting Premenopausal Women
Premenopausal women with major depression had significantly higher neuropeptide Y levels (280.80 pg/mL) than men or postmenopausal women, with NPY strongly correlating with appetite changes — suggesting sex-specific approaches to depression treatment.
Quick Facts
What This Study Found
Among 210 MDD patients divided into three groups:
- Premenopausal women (n=80): NPY = 280.80 ± 35.50 pg/mL (highest)
- Men (n=65): NPY = 250.50 pg/mL (estimated from differences)
- Postmenopausal women (n=65): NPY = 252.10 pg/mL (estimated from differences)
Key findings:
- Premenopausal women's NPY was significantly higher than men (Δ=30.30, p=0.007) and postmenopausal women (Δ=28.70, p=0.009)
- No difference between postmenopausal women and men (Δ=1.60, p=0.989)
- Similar group patterns were seen for appetite (VAS scores)
- NPY positively correlated with appetite (r=0.422-0.437)
- The NPY-appetite correlation was strongest in premenopausal women and weakest in postmenopausal women (β=0.007, p=0.021)
- Correlation held after controlling for depression severity
Key Numbers
How They Did This
Cross-sectional study of 210 patients with major depressive disorder. Participants were divided by sex and reproductive status: males (n=65), premenopausal women (n=80), postmenopausal women (n=65). Serum NPY levels were measured by ELISA. Appetite was assessed using a visual analog scale (VAS). Depression severity was evaluated with the 17-item Hamilton Depression Rating Scale (HDRS-17). Statistical analysis included one-way ANOVA with post-hoc tests and stratified regression models.
Why This Research Matters
Depression affects appetite differently in men and women, but the biological reasons have been poorly understood. This study shows that neuropeptide Y — a key appetite-regulating peptide — varies dramatically by sex and menopausal status in depressed patients. This suggests that the appetite disturbances in depression may require different management strategies for premenopausal women versus men or postmenopausal women, potentially informing the choice of antidepressants and nutritional support.
The Bigger Picture
Neuropeptide Y is one of the most abundant neuropeptides in the brain and plays critical roles in appetite, stress response, anxiety, and mood regulation. Its involvement in depression has long been suspected, but this study provides some of the first evidence that NPY's role in depression-related appetite changes is sex-specific and influenced by reproductive aging. This connects to the broader understanding that depression is not a single disease but varies biologically across populations, supporting the growing push for personalized psychiatry.
What This Study Doesn't Tell Us
The study lacked a healthy control group, so it cannot determine whether the observed NPY differences are specific to depression or reflect general population differences between sexes and menopausal status. Cross-sectional design prevents causal conclusions. Serum NPY may not directly reflect brain NPY levels. Hormonal status (estrogen, progesterone) was not directly measured. The study did not control for antidepressant medication use, which could affect NPY levels. The abstract contains apparent formatting errors in the statistical reporting.
Questions This Raises
- ?Would restoring NPY levels in premenopausal women with depression specifically improve their appetite-related symptoms?
- ?Do these sex differences in NPY persist in treated versus untreated depression, and do antidepressants affect NPY differently by sex?
- ?Could NPY levels serve as a biomarker for predicting appetite-related depression subtypes?
Trust & Context
- Key Stat:
- NPY 30 pg/mL higher in premenopausal women Premenopausal women with depression had significantly higher neuropeptide Y levels than men (Δ=30.30, p=0.007) — but postmenopausal women's levels dropped to match men's, suggesting reproductive hormones powerfully modulate this appetite-regulating peptide.
- Evidence Grade:
- This is a cross-sectional observational study with 210 participants. While it identifies interesting associations between NPY, sex, menopausal status, and appetite in depression, the lack of healthy controls, cross-sectional design, and inability to measure brain NPY directly limit the strength of conclusions.
- Study Age:
- Published in 2026, this is a very recent study contributing to the emerging understanding of sex-specific neuropeptide biology in psychiatric disorders.
- Original Title:
- Differences in serum neuropeptide Y levels and appetite changes in patients with major depressive disorder stratified by sex and reproductive aging.
- Published In:
- BMC psychiatry, 26(1), 111 (2026)
- Authors:
- Yuan, Qianfa, Wang, Li(5), Zhuang, Yuan(2), Lin, Duoduo, Xu, Zhizhong, Wen, Chunyan, Su, Weichao, Huang, Zhiyuan, Qiu, Yan
- Database ID:
- RPEP-16517
Evidence Hierarchy
Frequently Asked Questions
What is neuropeptide Y and how does it relate to depression?
Neuropeptide Y (NPY) is one of the most abundant signaling molecules in the brain. It plays key roles in regulating appetite, stress response, anxiety, and mood. In depression, appetite changes (either increased or decreased) are a core symptom. This study found that NPY levels vary significantly between depressed men and women, and that NPY is more strongly connected to appetite changes in premenopausal women — suggesting that reproductive hormones influence how this peptide functions in the context of depression.
Why do postmenopausal women's NPY levels match men's?
The study found that postmenopausal women had NPY levels nearly identical to men (only 1.60 pg/mL difference, not significant), while premenopausal women had levels about 30 pg/mL higher. This pattern strongly suggests that estrogen and other reproductive hormones influence NPY production or regulation. After menopause, when these hormones decline dramatically, women's NPY levels appear to 'reset' to male-like levels — further evidence that reproductive biology shapes the biology of depression.
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Cite This Study
https://rethinkpeptides.com/research/RPEP-16517APA
Yuan, Qianfa; Wang, Li; Zhuang, Yuan; Lin, Duoduo; Xu, Zhizhong; Wen, Chunyan; Su, Weichao; Huang, Zhiyuan; Qiu, Yan. (2026). Differences in serum neuropeptide Y levels and appetite changes in patients with major depressive disorder stratified by sex and reproductive aging.. BMC psychiatry, 26(1), 111. https://doi.org/10.1186/s12888-025-07753-9
MLA
Yuan, Qianfa, et al. "Differences in serum neuropeptide Y levels and appetite changes in patients with major depressive disorder stratified by sex and reproductive aging.." BMC psychiatry, 2026. https://doi.org/10.1186/s12888-025-07753-9
RethinkPeptides
RethinkPeptides Research Database. "Differences in serum neuropeptide Y levels and appetite chan..." RPEP-16517. Retrieved from https://rethinkpeptides.com/research/yuan-2026-differences-in-serum-neuropeptide
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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.