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    Uric Acid

    u·ric ac·id — YOOR-ik AS-id

    Definition

    Uric acid is a chemical compound produced when the body breaks down purines — natural substances found in certain foods and produced by the body's own cells during normal metabolism. Under normal conditions, uric acid dissolves in the blood, passes through the kidneys, and is excreted in urine. However, when the body produces too much uric acid or the kidneys don't excrete enough, levels can build up in the blood (hyperuricemia), potentially leading to gout and kidney stones.

    Gout — the most well-known consequence of high uric acid — occurs when uric acid crystallizes in joints, causing sudden, severe episodes of pain, swelling, redness, and warmth, most commonly in the big toe. These crystals trigger an intense inflammatory response that can be excruciatingly painful. Uric acid kidney stones form when uric acid concentrations in the urine become too high, creating hard deposits that can obstruct the urinary tract.

    Beyond gout, emerging research links chronically elevated uric acid levels to cardiovascular disease, hypertension, kidney disease, metabolic syndrome, and type 2 diabetes — though whether uric acid is a causal factor or simply a marker of metabolic dysfunction is still debated. Interestingly, uric acid also functions as an antioxidant in the blood, accounting for roughly 50% of the blood's antioxidant capacity, suggesting a complex dual role in health.

    Also Known As

    UrateSerum urate

    Key Facts

    • •Normal serum uric acid: 3.5-7.2 mg/dL for men, 2.6-6.0 mg/dL for women.
    • •High-purine foods that can raise uric acid include organ meats, shellfish, red meat, beer, and fructose-sweetened beverages.
    • •Gout affects approximately 9.2 million Americans (about 4% of adults), with men affected 3-4 times more often than women.
    • •Uric acid paradoxically acts as a powerful antioxidant in the blood, providing approximately 50% of plasma antioxidant capacity.
    • •Medications like allopurinol and febuxostat lower uric acid production, while probenecid increases excretion.

    How It Relates To Your Health

    Uric acid levels are commonly measured in blood tests when evaluating joint pain, kidney stones, or metabolic health. If you've had a gout attack, long-term urate-lowering therapy may be recommended to prevent future episodes and joint damage. Target serum uric acid below 6.0 mg/dL is the typical treatment goal.

    Dietary modifications that help manage uric acid include limiting high-purine foods (organ meats, shellfish), reducing alcohol intake (particularly beer), minimizing fructose-sweetened beverages, staying well-hydrated, and consuming low-fat dairy products (which appear to promote uric acid excretion). Cherry consumption and vitamin C supplementation have modest evidence for lowering uric acid.

    Sources

    1. Gout — Mayo Clinic
    2. Hyperuricemia — StatPearls / PubMed
    3. Uric Acid — MedlinePlus (NIH)

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