Uric Acid
A byproduct of purine metabolism — both a marker of metabolic health and, when elevated, a driver of gout and kidney disease.
Optimal Range
3.5-5.5 mg/dL (optimal) · < 7.0 mg/dL (lab range)
Risk-Stratified Targets
| Population / Context | Target |
|---|---|
| Optimal (longevity) | 3.5–5.5 mg/dL |
| Normal lab range | < 7.0 mg/dL (men) · < 6.0 mg/dL (women) |
| Elevated (metabolic risk)Even without gout, associated with hypertension and insulin resistance | 6.0–7.0 mg/dL |
| High (gout and kidney risk) | > 7.0 mg/dL |
| Very highSignificant risk of gout, nephrolithiasis, and CKD | > 9.0 mg/dL |
Why It Matters
Elevated uric acid is linked to hypertension, insulin resistance, kidney disease, and cardiovascular risk. It is increasingly recognized as a modifiable driver of metabolic syndrome, not just a gout marker.
Understanding Uric Acid
Uric acid is the end product of purine metabolism in humans. Unlike most mammals, humans lack the enzyme uricase, which means we cannot break down uric acid further — it must be excreted by the kidneys. This evolutionary quirk makes humans uniquely susceptible to hyperuricemia (elevated uric acid) and its consequences.
While gout (painful crystal deposition in joints) is the most well-known consequence of elevated uric acid, research has revealed that uric acid is far more than a gout marker. Elevated uric acid directly damages blood vessel endothelium, activates the renin-angiotensin system (raising blood pressure), promotes insulin resistance through intracellular oxidative stress, and contributes to kidney damage through crystal deposition in renal tubules. These mechanisms make uric acid a modifiable driver of hypertension, metabolic syndrome, and chronic kidney disease.
Dietary purines (from organ meats, shellfish, and beer) contribute to uric acid levels, but fructose is an often-overlooked driver — fructose metabolism in the liver directly generates uric acid through ATP depletion and purine degradation. Reducing fructose intake (particularly from sugar-sweetened beverages and processed foods), moderating alcohol consumption (especially beer), staying well-hydrated, and maintaining a healthy weight are the most effective lifestyle strategies for lowering uric acid.
Key Research
Uric acid and chronic kidney disease: which is chasing which?
Johnson RJ et al. · Nephrol Dial Transplant (2013)
Key finding: Evidence supports uric acid as both a marker and a causal factor in hypertension, kidney disease, and metabolic syndrome — not merely a byproduct of purine metabolism.