Bardet-Biedl Syndrome
A rare genetic ciliopathy characterised by severe early-onset obesity caused by impaired hypothalamic appetite regulation, requiring specialised multidisciplinary care.
Plain English
Patient-Friendly Explanation
Bardet-Biedl Syndrome (BBS) is a rare genetic condition that affects multiple parts of the body, with severe obesity being one of its most prominent features. People with BBS often experience insatiable hunger from an early age because the genetic mutation disrupts the brains ability to sense when the body has had enough food. The condition also affects vision, kidney function, and limb development, requiring coordinated care from multiple medical specialists throughout life.
Medical
Clinical Definition
Bardet-Biedl Syndrome is an autosomal recessive ciliopathy caused by mutations in at least 21 BBS genes (BBS1-BBS21) that impair primary cilia function. Hyperphagia and early-onset obesity result from disrupted leptin receptor signalling in hypothalamic neurons, which rely on intact ciliary transport. Diagnosis is clinical, based on primary features (rod-cone dystrophy, polydactyly, obesity, renal anomalies, hypogonadism, learning difficulties) with genetic confirmation. Setmelanotide, an MC4R agonist, is the first FDA-approved therapy targeting the underlying hyperphagia.
Key Insight
Why It Matters
BBS represents one of the clearest examples of how genetic defects can directly drive severe obesity through disrupted appetite regulation, independent of lifestyle. Understanding rare genetic obesity syndromes like BBS helps clinicians at Accord Medical recognise when standard weight loss approaches may be insufficient and when targeted pharmacological intervention is needed.
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.
