Appetite Hormones Create a Distinct Pattern in Prader-Willi Syndrome | Research

The takeaway

Patients with Prader-Willi syndrome show a distinctive hormonal fingerprint with elevated fasting levels of ghrelin, leptin, PYY, GIP, and GLP-1, distinguishing them from obese and healthy controls.

23 of 27 PWS patients in a distinct cluster
Showing hyperghrelinemia alongside elevated satiety hormones — a paradoxical pattern not seen in obesity alone

What the researchers found

Cluster analysis separated PWS patients (23/27) into a distinct group with paradoxically elevated levels of both hunger (ghrelin) and satiety (leptin, PYY, GIP, GLP-1) hormones, suggesting hormonal dysfunction rather than simple imbalance.

Why it matters

Understanding the specific hormonal dysfunction in PWS could lead to targeted therapies for the uncontrollable hunger that is the hallmark of this genetic condition, which currently has no effective pharmacological treatment.

The numbers in context

30 per group; 9 hormones; 4 time points; 23/27 PWS in Cluster 2; elevated ghrelin, leptin, PYY, GIP, GLP-1; PP declined post-60 min

How the study worked

Prospective study comparing 30 PWS adults, 30 obese controls, and 30 healthy controls. Nine appetite-related peptides/hormones measured at fasting and 30, 60, and 120 minutes after a hypercaloric liquid diet. Cluster analysis applied.

Who was studied

30 PWS adults (mean age 27.5, BMI 32.4), 30 obese controls, 30 healthy controls

What this study cannot tell us

Moderate sample size (n=30 per group). Only 27 of 30 PWS patients had complete data for cluster analysis. Cross-sectional design cannot establish causation. Single meal challenge may not capture full hormonal dynamics.

How to read the evidence

Well-designed prospective study with appropriate controls and standardized meal challenge. Moderate sample size provides meaningful but not definitive evidence.

When this study was published

Published in 2021, contributing to evolving understanding of hormonal dysregulation in Prader-Willi syndrome.

The bigger picture

Prader-Willi syndrome causes extreme, uncontrollable hunger leading to severe obesity if left unmanaged. This study reveals that the problem isn't simply too much ghrelin — it's a comprehensive dysfunction affecting multiple appetite hormones simultaneously, which may explain why single-target therapies have been unsuccessful.

Questions still open

Could therapies targeting multiple appetite hormones simultaneously be more effective for PWS?
Why are satiety hormones elevated in PWS patients despite persistent hunger — is there receptor-level resistance?
What drives the abnormal pancreatic polypeptide response, and could it be a therapeutic target?

Common questions

Why are people with Prader-Willi syndrome always hungry?

This study shows it's not simply about having too much of the hunger hormone ghrelin. PWS patients have a complex dysfunction where both hunger and fullness hormones are abnormally elevated, suggesting the brain's ability to process appetite signals is fundamentally disrupted.

Could hormone therapy help control hunger in Prader-Willi syndrome?

The finding that multiple hormones are dysfunctional simultaneously suggests that targeting just one hormone may not be enough. Future therapies may need to address the broader signaling dysfunction, perhaps targeting hormone receptors or downstream pathways rather than hormone levels themselves.

Read the original research

Hunger and Satiety Peptides: Is There a Pattern to Classify Patients with Prader-Willi Syndrome?

Journal of clinical medicine, 10(21)

View on PubMed ↗Publisher’s paper ↗

Citation

Bueno, Marta; Boixadera-Planas, Ester; Blanco-Hinojo, Laura; Esteba-Castillo, Susanna; Giménez-Palop, Olga; Torrents-Rodas, David; Pujol, Jesús; Corripio, Raquel; Deus, Joan; Caixàs, Assumpta. (2021). Hunger and Satiety Peptides: Is There a Pattern to Classify Patients with Prader-Willi Syndrome?. Journal of clinical medicine, 10(21). https://doi.org/10.3390/jcm10215170