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Ghrelin and Synthetic GH Secretagogues: A Unified View of the System

RPEP-007112002Arvat, Emanuela; Broglio, Fabio; Aimaretti, Gianluca; Benso, Andrea; Giordano, Roberta; Deghenghi, Romano; Ghigo, Ezio
ReviewModerate evidence
The takeaway

This review synthesizes ghrelin's biology with the decades of synthetic GH secretagogue research, presenting a unified view of the GHS system's roles in GH release, appetite, adiposity, and cardiovascular function.

Multi-system regulator

The ghrelin-GHS system is now understood as controlling GH + appetite + fat + heart function — far more than just growth hormone

What the researchers found

The ghrelin-GHS system is a multi-functional endocrine network with validated roles in GH regulation, appetite control, adiposity, and cardiovascular function, with therapeutic implications across multiple medical specialties.

Why it matters

Presenting the unified ghrelin-GHS system helps clinicians understand why GH secretagogues affect appetite, body composition, and heart function — not just GH levels.

How the study worked

Review synthesizing ghrelin biology with synthetic GH secretagogue pharmacology and clinical data.

What this study cannot tell us

Review from 2002; some ghrelin functions were still being characterized. Long-term therapeutic implications were still speculative.

How to read the evidence

Moderate evidence from a comprehensive review synthesizing molecular, clinical, and pharmacological data.

When this study was published

Published in 2002. The ghrelin system's diverse functions have been extensively confirmed over the following two decades.

The bigger picture

The ghrelin system is now recognized as a master metabolic regulator, not just a GH-releasing pathway. This unified understanding has driven drug development across multiple therapeutic areas.

Questions still open

  • Which ghrelin function is most therapeutically valuable?
  • Can ghrelin system modulation treat metabolic syndrome?
  • How does the unified system inform drug selectivity?

Common questions

Is ghrelin just about hunger?
No. This review shows ghrelin controls GH release, appetite, body fat distribution, and heart function. It's a multi-system metabolic regulator that happens to make you hungry as one of its many effects.
Do GH peptides cause weight gain?
Ghrelin and GH secretagogues can increase appetite and promote fat storage in some contexts, but they also increase lean mass and GH. The net effect on body composition depends on the specific compound, dose, and patient population.

Read the original research

Ghrelin and synthetic GH secretagogues.

Best practice & research. Clinical endocrinology & metabolism, 16(3), 505-17

View on PubMed ↗

Citation

Arvat, Emanuela; Broglio, Fabio; Aimaretti, Gianluca; Benso, Andrea; Giordano, Roberta; Deghenghi, Romano; Ghigo, Ezio. (2002). Ghrelin and synthetic GH secretagogues.. Best practice & research. Clinical endocrinology & metabolism, 16(3), 505-17.