Bilirubin and Metabolic health

Bilirubin is traditionally measured as a marker of liver function or jaundice. Emerging research, however, reveals that mildly elevated levels within or near the normal range—most notably in Gilbert’s syndrome—are consistently linked to better metabolic health.

This ebook explores the growing evidence that bilirubin acts as a potent endogenous antioxidant and anti-inflammatory molecule. Higher bilirubin levels are associated with lower risk of metabolic syndrome, type 2 diabetes, non-alcoholic fatty liver disease (MASLD/NAFLD), insulin resistance, and cardiovascular disease. Mechanisms include reduced oxidative stress, improved lipid metabolism and fat oxidation, enhanced insulin sensitivity, and favorable effects on body composition.

Drawing on epidemiological studies, mechanistic insights, and clinical observations, Bilirubin and Metabolic Health examines what these findings mean for everyday practice and patient care. It offers a clear, evidence-based perspective on a previously overlooked factor in metabolic resilience—and why bilirubin may deserve more attention in the assessment and management of metabolic disease.