How to Help Prevent Kidney Stones

Start With Fluids and Daily Habits

One of the most important ways to help prevent kidney stones is to get enough fluids. When you drink enough, your urine stays more diluted, which makes it harder for stone-forming substances to collect and harden. Water is usually the best main drink, but hydration does not have to come only from water. Some citrate-containing drinks may also help because citrate can lower the chance of certain stones forming. Lower-sugar choices, such as water with lemon juice or other unsweetened citrus-based drinks, are usually better than heavily sweetened beverages. Orange juice may help some people, but sugar content, calories, and other health conditions still matter. You may need even more fluids in hot weather, during exercise, or anytime you are sweating more than usual.

Food Choices That Can Lower Risk

Food choices can play a major role in kidney stone prevention. A high-sodium diet can raise the amount of calcium in the urine, so cutting back on salty processed foods, canned soups, fast food, and packaged snacks can help. It is also important not to cut out calcium from food unless a clinician tells you to. Calcium from foods such as milk, yogurt, and fortified alternatives can actually help by binding oxalate in the digestive tract. Eating large amounts of animal protein may raise risk for some stones, so some people benefit from smaller portions of meat and more plant-based proteins such as beans or lentils. Fruits and vegetables are also helpful because they can increase citrate and support overall kidney health. If you tend to form calcium oxalate stones, you may also be advised to limit very high-oxalate foods such as spinach, rhubarb, wheat bran, and large amounts of nuts.

Quick Tips for Everyday Prevention

• Aim to maintain adequate fluid intake throughout the day, using water as the main beverage and considering low-sugar citrate-containing options, such as water with lemon juice, when appropriate; increase fluids further when sweating more than usual.
• Limit sodium by choosing fresh foods more often and checking labels on packaged foods.
• Get calcium from foods rather than assuming all calcium should be avoided.
• Moderate portions of meat, poultry, and seafood, especially if advised to reduce animal protein.
• Eat more fruits and vegetables to support citrate intake and overall kidney health.
• If you have had calcium oxalate stones, discuss high-oxalate foods and individualized goals with a healthcare professional or dietitian.
• Reduce sugar-sweetened beverages, especially sodas and other drinks with high fructose content.
• Ask about stone analysis or 24-hour urine testing if stones recur, since prevention is most effective when tailored to the stone type.

Kidney Stone Prevention by Stone Type

• Calcium oxalate stones: These are the most common kidney stones. Prevention usually focuses on adequate fluid intake, lowering sodium, maintaining normal dietary calcium, and reducing very high-oxalate foods when indicated. It is generally better to obtain calcium from food rather than severely restricting calcium intake, because dietary calcium can help bind oxalate in the gut. Some patients may also be advised to moderate animal protein and review vitamin C or supplement use with a clinician.
• Calcium phosphate stones: Prevention also includes good fluid intake and sodium reduction, but these stones are more strongly associated with alkaline urine. Evaluation may be needed for medical conditions such as renal tubular acidosis or for medications that can affect urine chemistry. Patients may still benefit from standard calcium stone measures, but management is often more dependent on the findings of urine testing and clinician guidance.
• Uric acid stones: These stones tend to form when the urine is persistently acidic. Prevention includes increasing fluids, moderating animal protein, and reducing excess intake of high-purine foods such as organ meats and some seafood. Many patients also need treatment directed at raising urine pH under medical supervision, since correcting acidic urine is often central to prevention.
• Struvite stones: These stones are commonly associated with urinary tract infections caused by certain bacteria. Prevention depends mainly on identifying and treating infection, removing infected stones when necessary, and following urologic guidance. Diet is usually not the primary driver of recurrence for this stone type.
• Cystine stones: These result from a hereditary disorder called cystinuria. Prevention often requires very high fluid intake and more specialized treatment to reduce cystine concentration and improve urine chemistry. Because this stone type is uncommon and often recurrent, management usually needs close follow-up with specialists.

If you keep getting kidney stones, stone testing and a 24-hour urine test can help your healthcare team choose the prevention plan that fits you best.

The bottom line: many kidney stones can be prevented with the right daily habits. Drinking enough fluids, cutting back on sodium, getting calcium from food, moderating animal protein, and eating more fruits and vegetables can all help lower risk. Because prevention works best when it matches your stone type and health history, talk with your healthcare professional if you have had more than one stone or want a plan tailored to you.

Kidney Cookbook - Urology Care Foundation

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