Obestatin
Obestatin is a stomach hormone linked to appetite and fullness — the lesser-known partner of ghrelin, the 'hunger hormone'.
Plain English
Patient-Friendly Explanation
Obestatin is a small hormone produced mainly in the stomach, derived from the same parent molecule as ghrelin — the famous 'hunger hormone'. While ghrelin tells your brain you are hungry, obestatin was named for its proposed role in signalling fullness, and early research suggested it could reduce appetite and slow digestion. Its exact role in humans is still being studied.
Medical
Clinical Definition
Obestatin is a 23-amino-acid peptide cleaved from preproghrelin alongside ghrelin. Initial studies reported anorexigenic effects — reduced food intake, delayed gastric emptying and decreased jejunal motility — mediated through binding to GPR39 (now questioned). Subsequent research has produced conflicting results on its physiological significance and on circulating levels in obesity; some studies show lower obestatin/ghrelin ratios in obese individuals. It is not currently a therapeutic target but remains of research interest in appetite regulation.
Key Insight
Why It Matters
Appetite is controlled by a balance of many hormones — not just one. Understanding the ghrelin–obestatin system helps explain why hunger is biological, and why medical weight management targets these signals.
Sources
Reviewed against standard medical references.
Medically reviewed by
Family Physician & Registered Acupuncturist, Accord Medical Clinic. MBBS (NUS), Graduate Diploma in Family Medicine (NUS), Graduate Diploma in Acupuncture (Singapore College of TCM).
Last reviewed: August 2026
This page is general health education, not medical advice. Whether any treatment is appropriate for you is a decision made in consultation after assessment.
