Gout and Kidney Stones: What to Eat and Avoid to Prevent Both

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Gout and kidney stones often go hand-in-hand. It’s important to understand what they are, and what you can do with your diet to prevent both from occurring. Learn more in this article about what you can do for both gout and kidney stones.

Gout and kidney stones are both found to increase the risk of developing chronic kidney disease. These health issues are also heavily influenced by dietary factors such as protein, fluids, and produce. By focusing on controlling both gout or kidney stones, the kidneys may also be protected.

It’s been found that more than half of people that have gout will also develop a kidney stone. In this article, I’ll dive into gout and uric acid stones, the second-most common type of kidney stone.

What Is Gout?

Gout is a type of arthritis that is inflammatory and very painful. It can be acute or chronic. Acute gout means only one joint is affected with flares. Chronic gout includes multiple joints with repeated episodes of flares.

It’s important to know that just having a high uric acid level does not mean you have gout. In fact, most people that have high uric acid don’t get gout or kidney stones

Gout and Kidney Stones: What to Eat and Avoid to Prevent Both (image is a tablescape with tortillas, chips, peppers, onions, limes and salsa)

What Causes Gout?

Gout is caused by a buildup of uric acid. When a person develops high levels of uric acid in their blood, known as hyperuricemia, the urate crystals can collect and can then stick around the join areas.

Hyperuricemia does not always lead to symptoms or a diagnosis of gout. If high levels of uric acid are noted without symptoms, it may not need to be treated.

Uric acid is produced when the body breaks down purines. The kidneys are generally responsible for eliminating excessive uric acid from the body. This, however, does not always happen, especially in people with kidney disease.

Who Is At Risk For Gout?

In general, gout is more common in men. Additional risk factors for gout include obesity, high blood pressure, congestive heart failure, insulin resistance or diabetes, or kidney disease.

Those with kidney disease are at a higher risk for developing gout due to the limited ability to remove uric acid from the body.

Other risk factors for developing gout include using certain medications (such as water pills), drinking alcohol, or a diet high in sugar or purines.

What Are The Symptoms Of Gout?

Gout symptoms include sudden and severe jolts of pain, usually at the joints. It can feel hot, swollen and tender. A person experiencing a gout attack may also complain of limited mobility and movement.

How Do I Know If I Have Gout?

Gout can only be diagnosed during a flare. Your doctor can diagnose with an x-ray and lab tests. They will look for uric acid crystals in the inflamed joint.

Only a doctor can diagnose you with gout. You can look for a rheumatologist, which is a doctor that specializes in musculoskeletal disease and systemic autoimmune conditions.

Labs to Test for Gout

Some of the lab tests that can be done to check for gout include;

  • Synovial fluid analysis
  • Uric acid
  • Renal function panel
  • Basic metabolic panel
  • Complete blood count

And as mentioned above, an x-ray or ultrasound of the affected joint can also be used to look for the uric acid crystals.

Medications And Gout

One of the most common medications prescribed for gout is allopurinol. Newer research is now showing that a newer medication, febuxostat (aka Uloric), is showing more promising results in lowering uric acid for those with both gout and kidney disease.

Corticosteroids such as prednisone may be prescribed to help with inflammation and pain of gout. This is also a common medication for certain kidney conditions as well. Of note are the side effects that can come with corticosteroids, including but not limited to weight gain, increased appetite, and edema.

Another anti-inflammatory drug is colchicine and may be prescribed to help with gout. It’s important to note that the side effects of this group of medications can include nausea, vomiting, stomach pain, and diarrhea.

NSAIDs have also been recommended to treat gout. However, NSAIDs can cause kidney disease and are not recommended if there is a family history of kidney disease.

That being said, a study in 2021 found that a group of individuals who had kidney disease was prescribed gout medication without indication the medicine was needed. 

Whatever medication you are currently taking, it’s always very important to first discuss any changes with your primary care physician or nephrologist. They will be able to assess your case and determine what medication will be the best for you.

Gout And Chronic Kidney Disease

Kidney disease and gout are both closely intertwined. A study in 2021 found that those with uncontrolled gout had a significantly increased risk of not only developing kidney disease but having more advanced kidney disease.

It’s important to note that the kidneys are responsible for eliminating more than 70% of the uric acid in the body. Therefore, if a person has kidney disease it can be important to monitor uric acid levels and make dietary changes to prevent uric acid buildup.

That being said, research has shown that even without symptoms of gout or kidney stones, having high levels of uric acid when you have kidney disease can increase the progression of kidney disease. 

Pie chart showing that 71% of people with gout have kidney disease, according to the NHANES survey of 2008

From the National Health and Nutrition Examination Survey in 2008, 71% of people with gout also had kidney disease. And for those with severely high uric acid, 86% had kidney disease.

It’s important to be aware of your uric acid level and talk with your doctor about how to best manage it. 

Is There A Relationship Between Gout and Kidney Stones?

Uric acid stones are the second-most commonly formed kidney stones, behind calcium oxalate stones. As gout is also related to excessive uric acid in the body, the connection between both of these health issues is uric acid.

One study early in 2020 showed that in researching the prevalence of stones, 13.9% were caused by high uric acid levels. In the study, the ages of those with these stones were in their 30s up to the 60s.

Another study found that in a group of gout patients, 31% had developed kidney stones. Of the kidney stone developers, more than half of them had no history of kidney stone formation before their gout diagnosis.

Pie chart showing that 31% of people with gout have kidney stones, according to the NHANES survey of 2008

A condition known as uric acid nephrolithiasis is when there is a low urine pH, low urine volume, that lead to uric acid stone formation.

Can You Dissolve Uric Acid Kidney Stones?

Uric acid stones can be dissolved with potassium citrate, a medication prescribed by your urologist. A urologist is someone who focuses on your urinary tract, including kidney stones. This may be different from a kidney specialist.

If potassium balance is a concern, the doctor may order sodium bicarbonate to help with the urine pH.

Always take prescribed medications as directed by the prescribing physician.

If the stone cannot be dissolved with medicinal interventions, shock wave lithotripsy or surgical interventions may be needed.

Foods To Limit or Avoid With Gout and Kidney Stones

There are some foods that you will want to avoid if you suffer from both gout and kidney stones. In limiting or avoiding these foods, you can decrease your risk for gout flares or uric acid stones.

Processed/Packaged Foods

Processed foods have a higher likelihood of being high in sodium. Diets high in sodium can cause more gout and uric acid stone attacks.

When possible, read labels to look for low-sodium options in packaged foods. When going out to eat, look for fast food options that are lower in sodium. Ideally, foods should be free of phosphate additives as well.

Organ Meats

Meats like liver, sweetbreads, and kidney are considered organ meats. These types of meats are very high in purines. Because of this, avoiding these foods can be very helpful in preventing both gout and uric acid stones.

Animal Meat

Beyond just organ meats, animal meats like beef, lamb, and pork can also contribute to uric acid levels and the risk of kidney stones. High-protein diets increase the risk for high uric acid levels.

Regarding kidney stones, a high protein diet can reduce the levels of citrate in the urine, which is what helps prevent stones from forming.

Animal meats may also be limited if you have kidney disease. Many need to follow a low protein diet. 

Some Seafood

Tuna, sardines, shellfish, and anchovies are examples of seafood that are high in purines and can increase uric acid levels. 

That being said, including a small amount of fish rich in omega-3s has been shown to be associated with lower gout flares.

Alcohol

Drinking too much alcohol can increase uric acid levels. While alcohol is thought to be helpful with urinating, alcohol has been shown to increase uric acid levels, uric acid stones, and gout

Wine has more recently been in question as to whether or not it can increase the risk of gout.

Added Sugars

Sugary foods like cereals, doughnuts, candies, chocolates, and sodas provide very limited nutritional value. What they can provide is a lot of extra sugar. Excess sugar has been linked to an increased risk of gout.

Kidney stones are also found to be more common in diets high in sugar, especially sugary beverages and fructose.

Foods to Avoid with Gout and Kidney Stones: Processed/packaged foods, organ meats (like liver, sweetbreads and kidney), Animal Meats (including some seafood), Alcohol, Added sugars

Foods To Include With Gout and Kidney Stones

While the thought of eating with both gout and kidney stones sounds overwhelming, there is plenty of foods you can enjoy while still avoiding both!

Fruits

Evidence has shown that cherries (any type!) can help in reducing gout attacks. Even though fruit is a source of fructose, they are not shown to be a factor in a high-fructose diet.

A diet rich in fruits and vegetables has been shown to produce lower uric acid levels. Fruits and vegetables are also a great part of a PRAL diet!

Vegetables

While there are some high-purine vegetables, like asparagus and spinach, research has shown that moderate consumption of these doesn’t increase the risk of gout attacks.

Certain high-oxalate vegetables such as spinach, beets, potatoes, and okra may need to be limited or avoided if oxalate levels are high. This is not a consideration when speaking to uric acid kidney stones.

Whole Grains

Whole grains are a part of the DASH Diet. A long-term study found that people following the DASH diet had a lower risk of high uric acid levels and gout.

Even whole grains that have purines have great benefits to help lower the risk of heart disease, stroke, and diabetes!

Heart-Healthy Fats

Heart-healthy fats, also part of the DASH diet, can be included in a diet that avoids gout, kidney stones, and even kidney disease. A study looking at omega-3 polyunsaturated fats and gout found that diets that included these healthy fats had a lower risk of gout.

Interestingly, the omega-3 supplements alone did not have the same results.

Avocado oil, olive oil, flaxseed/flaxseed oil, chia seeds, hemp seeds are all examples of heart-healthy fats.

Avocado oil is a kidney-friendly and healthy oil that can be included in a renal diet. Healthy fats with omega-3 polyunsaturated fats have been shown to lower risk of gout.

Fish has been found to have higher levels of purines. Purines, as mentioned above, are associated with higher uric acid levels.

Nuts and Nut Butters

Another healthy fat source! Peanuts have specifically been found to be in a diet that produced lower urate levels.

Certain nuts like almonds may need to be limited for calcium oxalate stones. However, uric acid stones and gout-related diet recommendations do not need an oxalate restriction.

Dairy

Dairy has seen to have a protective factor in preventing gout attacks. And while calcium is an important part of preventing calcium oxalate stones, it is not associated with an increased risk of uric acid stones.

The best dairy options to include are low-fat dairy products like milk, yogurt, and some cheeses. Of note is that dairy is higher in phosphorus, so it will also be important to read labels to avoid any phosphate additives.

Lean Meats

Lean meats such as chicken and some fish may be suitable for a diet to prevent both gout and uric acid kidney stones. However, as mentioned above, portion size is the most important factor when including something like this in your diet as too much protein is what can cause gout or kidney stones.

Keep animal protein choices to about 4 to 6 ounces daily or per your dietitian’s guidelines. Learn more about a low protein diet for kidney disease here.

Coffee

In moderation, coffee is shown to lower the risk of gout. There is not enough evidence to prove coffee to lower any risk of high uric acid levels though.

Remember, you can have coffee with kidney disease.

Foods to Include with Gout and Kidney Stones include Fruits, Vegetables, Whole Grains, Healthy Fats (like nuts and nut butters), dairy, coffee, and lean meats in moderation

Hydration

Drinking enough water is crucial to preventing both high uric acid and kidney stones. Recommendations can start at 8 or more cups per day. 

As mentioned above, not all beverages are treated equally with hydration. Water should be the main fluid you drink. Coffee can be included in small amounts and seen as beneficial. Milk will count as a good fluid as well.

Alcoholic beverages, however, will not decrease your risk for gout and kidney stones. Soda and other sweetened beverages will increase the risk of gout and kidney stones alike.

Be sure to check with your dietitian or doctor about how much water you should be drinking. If you have been advised to limit your fluids due to kidney disease, drinking above that will not help and could actually cause more problems.

Vitamin C

Vitamin C has been shown to be helpful with preventing gout flares. More recently, though, a review found that taking higher doses of vitamin C did not directly correlate with preventing or treating gout.

However, vitamin C supplements are something to be careful with if you have kidney issues as the kidneys are responsible for getting rid of any excess vitamin C.

An increased risk of kidney stones has been seen in men with vitamin C supplements.

We can get plenty of vitamin C in our diet with fruits and vegetables. If you’d like to add some more in an easy way, try squeezing some lemon juice into your water.

Watch the Video About Gout and Kidney Stones

Summary

While gout and kidney stones can both be painful diagnoses and situations. Many of the factors involved in how often they happen can be modified through changes in the diet.

By focusing on a diet rich in fruits and vegetables, low in animal meats, sugars, and alcohol, you can help prevent gout flares and uric acid kidney stones from happening.

It’s also important to stay well hydrated by drinking plenty of water. Coffee, tea, and milk can also be fluids that can be included and not increase risk of gout or uric acid kidney stones.

Supplementing with vitamin C is not proven to be effective in preventing either gout nor uric acid kidney stones. However, getting adequate vitamin C from foods in the diet may help reduce the risk of gout attacks.

Doing these things can not only help prevent gout flares but also protect against uric acid stones.

Eating to prevent gout and kidney stones. (Image is several clear glasses of chia seed pudding, decorated with strawberries, blueberries, raspberries and kiwi).

6 thoughts on “Gout and Kidney Stones: What to Eat and Avoid to Prevent Both”

  1. One of the side effects of allopurinol is kidney damage. Have you seen any decline in kidney functions on your patients who have been taking this gout medication for a long time?
    Thank you.

    1. The connection with allopurinol and kidney function is more that the medication can accumulate in the body with kidney damage, not that the medication itself causes a decline in kidney function (reference). As a dietitian, I advise my clients to always discuss prescribed medications with their prescribing physician to understand what the plan, goals, and expectations are with the medications. But to answer your question, no, I have not seen clients have a drop in kidney function related to allopurinol. I have seen it related to high uric acid levels.

  2. Can you tell me if Thalium isotopes used for a nuclear heart test will cause any harm? They told me the isotopes will be gone in a couple of days. Stage 3.. Thank you so much!!

  3. My husband has gout and has acute kidney failure. He has been on dialysis for about a month. They are telling him to eat more protein. What protein is ok for him to have since he has gout? We have also started the low sodium diet. I’m hoping this will help with both problems. Just confused how to help the gout.

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