Serum Uric Acid as a Risk Marker for Metabolic Syndrome in Middle-Aged Adults

Abstract

Serum uric acid is measured in almost every routine biochemistry panel, and in adults of middle age it tends to run higher in people who also have central obesity, raised blood pressure, disturbed lipids and impaired glucose handling, the cluster called metabolic syndrome. Whether uric acid is a useful marker of that cluster, a contributor to it, or simply a bystander carried along by the same causes is still argued. This narrative review summarises published work on how urate is produced and excreted, how insulin resistance and diet shift it, the mechanisms proposed to link it to vascular and metabolic disease, and what cohort studies, genetic studies and treatment trials have and have not shown. Associations in cohorts are consistent, while studies that use genetic variants as instruments give little support to a causal effect on blood pressure or heart disease, and trials of urate lowering are few and small. The review argues that uric acid is best treated as a marker of risk whose causal role is unproven, describes the confounding that makes interpretation difficult, and lists the evidence that would settle the question. No new data are reported.