Gout develops when uric acid builds up in the blood and forms needle-like crystals in your joints. This happens when levels rise above 6.8 mg/dL, the point at which uric acid can no longer stay dissolved and begins to crystallize. But reaching that threshold isn’t caused by any single factor. Diet, genetics, kidney function, body weight, and certain medications all play a role, often reinforcing each other.
Globally, gout affects between 1% and 6.8% of the population, with rates around 3.9% in the United States. Understanding what pushes uric acid levels higher is the first step toward preventing flares and long-term joint damage.
How Uric Acid Builds Up
Uric acid is the end product of purine metabolism. Purines are compounds found naturally in your cells and in many foods. When your body breaks them down, an enzyme called xanthine oxidase converts them first into a substance called xanthine, then into uric acid. Normally, your kidneys filter most of this uric acid out through urine, with a smaller amount leaving through the gut.
Gout occurs when this system falls out of balance. Either your body produces too much uric acid, your kidneys don’t excrete enough of it, or both. About two-thirds of gout cases involve under-excretion rather than overproduction. Once blood levels stay above 6.8 mg/dL for an extended period, urate crystals can deposit in joints and surrounding tissue, triggering the intense inflammatory response that defines a gout attack. Treatment guidelines aim to keep levels below 6 mg/dL, and sometimes below 5 mg/dL for people with visible crystal deposits called tophi.
Foods That Raise Uric Acid
Meat and Seafood
Animal-based purines are the most well-established dietary trigger. Organ meats (liver, kidneys, sweetbreads), red meat, and certain seafood like anchovies, sardines, mussels, and scallops are particularly high in purines. When you eat these foods regularly, you’re feeding more raw material into the uric acid production pathway.
Interestingly, purine-rich vegetables like asparagus, spinach, and green peas don’t carry the same risk. Studies have consistently shown that plant-based purines do not raise your likelihood of developing gout, likely because of differences in the types of purines involved and how your body processes them alongside the fiber and other compounds in vegetables.
Fructose and Sugary Drinks
Fructose is the only sugar that directly increases uric acid production, and it does so through a surprising mechanism. When your liver processes fructose, it rapidly uses up a molecule called ATP (your cells’ main energy currency). This depletion triggers a cascade: the leftover energy molecules get converted into uric acid precursors, and your body compensates by ramping up purine production, which generates even more uric acid when additional fructose arrives.
A meta-analysis published in BMJ Open found that people with the highest fructose intake had a 62% greater risk of developing gout compared to those who consumed the least. Sugary soft drinks and fruit juices are the primary culprits, since they deliver large doses of fructose quickly. This makes sweetened beverages one of the most modifiable risk factors for gout.
Alcohol
Alcohol raises uric acid in two ways. It increases purine breakdown during metabolism, and it impairs your kidneys’ ability to excrete uric acid. Beer is the worst offender because it contains both alcohol and its own load of purines from the brewing process. Liquor also raises risk, though to a lesser degree. Moderate wine consumption appears to carry less risk than beer or spirits, but heavy drinking of any type is a problem.
Genetics and Family History
Your genes have a significant influence on how efficiently your body handles uric acid. The two most important genetic factors involve proteins that transport uric acid in the kidneys and intestines. One gene, called SLC2A9, codes for a transporter in the kidneys that reabsorbs uric acid back into the blood. Variations in this gene can make your kidneys retain more uric acid than normal. Another gene, ABCG2, produces a transporter in the gut that helps excrete uric acid into the intestines. When this transporter doesn’t work well, less uric acid leaves through the gut, increasing the burden on the kidneys.
Research has identified selection pressure on ABCG2 across multiple gout subtypes, suggesting these genetic variants have been shaped by evolutionary forces and are deeply embedded in certain populations. Recent genome-wide studies continue to identify new genetic loci linked to gout susceptibility, reinforcing that heredity is a major piece of the puzzle. If a parent or sibling has gout, your own risk is substantially higher regardless of diet.
Body Weight and Insulin Resistance
Carrying excess weight is one of the strongest predictors of gout. Fat tissue produces more purines, and larger bodies generate more uric acid overall. But the connection goes deeper than simple overproduction.
Insulin resistance, the metabolic state where your cells stop responding normally to insulin, directly affects how your kidneys handle uric acid. When insulin levels are chronically elevated, your kidneys reabsorb more sodium, and uric acid gets pulled back into the bloodstream along with it. This means that even if your purine intake is moderate, insulin resistance can prevent your kidneys from clearing uric acid effectively. Since insulin resistance is a core feature of metabolic syndrome (which also includes high blood pressure, high triglycerides, and abdominal obesity), gout frequently clusters with these conditions. Losing weight and improving insulin sensitivity can meaningfully lower uric acid levels independent of dietary changes.
Kidney Function
Your kidneys are responsible for eliminating roughly 70% of the uric acid your body produces. Any condition that reduces kidney filtration capacity can tip the balance toward accumulation. Chronic kidney disease is especially problematic because it creates a vicious cycle: impaired kidneys excrete less uric acid, the elevated uric acid itself can damage kidney tissue further, and the medications used to manage kidney disease sometimes raise uric acid as a side effect.
Even mild reductions in kidney function that you might not notice, sometimes appearing as slightly abnormal blood work during a routine physical, can contribute to gradually rising uric acid levels over years.
Medications That Raise Uric Acid
Several common medications can push uric acid levels higher. Diuretics (water pills), frequently prescribed for high blood pressure and heart failure, are the most well-known culprits. They work by increasing urine output, which concentrates the remaining body fluid and makes crystal formation more likely. Some types also directly interfere with the kidneys’ ability to excrete urate.
Low-dose aspirin, often taken daily for heart protection, reduces uric acid excretion at the kidney level. Certain immune-suppressing drugs used after organ transplants have the same effect. If you’re taking any of these medications and notice joint symptoms, the medication may be a contributing factor worth discussing with your prescriber. In many cases, alternative drugs that don’t affect uric acid are available.
Age, Sex, and Hormonal Factors
Gout is far more common in men than in women, particularly before menopause. Estrogen helps the kidneys excrete uric acid more efficiently, which gives premenopausal women a natural buffer. After menopause, that protection fades, and women’s gout rates begin to climb. By age 65 and older, the gap between men and women narrows considerably. Among older adults globally, the age-standardized prevalence reached about 3,111 per 100,000 people in 2021.
Age itself is a risk factor simply because uric acid tends to accumulate over time. Years of borderline-high levels that never caused symptoms can eventually cross the crystallization threshold, which is why first gout attacks commonly occur in middle age for men and after menopause for women.
Dehydration and Physical Stress
Anything that concentrates your blood raises the effective concentration of uric acid. Dehydration from hot weather, intense exercise, illness, or simply not drinking enough fluids can push you past the crystallization point even if your baseline levels are only slightly elevated. Surgery, acute illness, and crash dieting can also trigger attacks by rapidly changing the body’s metabolic state, breaking down tissue and releasing a flood of purines into the bloodstream at once.
This is why gout attacks often seem to strike “out of nowhere” after a specific event: a rich holiday meal paired with alcohol and dehydration, a hospital stay, or a period of intense physical stress. The underlying uric acid level was already high, and the acute trigger simply tipped the balance.