Are Oranges Good for Kidney Stones?

Yes, an orange can fit a kidney-stone prevention diet for many people, although evidence that its citrate and alkali raise urinary citrate comes mainly from orange juice, not whole fruit.

Can an orange help prevent kidney stones?

An orange is a reasonable food choice for many people who form kidney stones, but it is not a proven treatment or a guarantee against another stone. It is one possible part of a broader plan; see the best foods for kidney stones for more context.

The right plan depends on the type of stone and the substances found in your urine. If you have had a stone, a clinician may recommend analyzing it and collecting urine for testing before giving personalized advice.

How might an orange affect kidney stones?

Citrate can bind to calcium in urine and make some calcium-containing crystals less likely to form. Orange juice contains citrate and provides an alkali load, which can raise urinary citrate and make urine less acidic. These effects may be useful for some people, particularly those with low urinary citrate.

The effect is not necessarily beneficial for every stone type. More alkaline urine can increase the risk of some calcium phosphate stones, even when a rise in citrate is helpful. Orange juice has also raised urinary oxalate in some studies; oxalate can combine with calcium to form stones.

Those findings are about juice and urine chemistry. They do not establish how much a whole orange changes urine citrate or whether eating an orange prevents a stone from forming. An orange should not be used to alter urine acidity without advice from your clinician.

What does the evidence say about orange and kidney stones?

A 2021 review of 13 studies on citrus juices and kidney stones found that small prospective studies reported increased urinary citrate with orange juice. Large observational studies in the review did not find an increased stone risk associated with orange juice, but that does not prove the juice prevents stones. The review also noted increases in urinary oxalate and called for better data.

In a small randomized crossover trial, 13 adults, including 4 people who formed stones, consumed orange juice under controlled dietary conditions. Compared with water, orange juice raised urinary citrate and pH and lowered a calculated measure of calcium oxalate stone risk. It also raised urinary oxalate and a calculated measure of calcium phosphate stone risk.

A trial of low-calorie orange juice in 10 healthy adults also measured changes in urine chemistry, including increased urinary citrate. The participants did not have a history of kidney stones, and the study did not establish that drinking orange juice prevents future stones. Neither trial tested eating a whole orange as a prevention strategy.

How can you include an orange safely?

If an orange fits your usual diet and your clinician has not advised limiting it, you can eat it as a whole fruit. There is no established amount of orange shown to prevent kidney stones, so eating extra oranges solely for that purpose is not necessary.

Make plain water your main drink unless your care team advises otherwise. Adequate fluid intake helps dilute urine, but the amount that is appropriate for you can depend on your health and any fluid restrictions. For more context, see the best drinks for kidney stones.

If adding fruit makes water more appealing, orange infused water is an option. The orange juice studies do not tell us how much citrate transfers into infused water or whether it has the same effects on urine.

Other parts of a prevention plan may matter more than any single food. Depending on your stone type, your clinician may recommend reducing sodium, maintaining an appropriate dietary calcium intake or adjusting other foods. Do not cut out calcium or change prescribed treatment simply because you have had a stone.

Who should be careful, and when should you get medical help?

Ask your clinician or kidney dietitian about oranges and orange juice if you have chronic kidney disease, high blood potassium or a prescribed potassium restriction. This is also important if you take medicines that can raise potassium, such as certain blood pressure medicines or potassium-sparing diuretics. Do not stop or change a medicine without medical advice.

If you have calcium phosphate stones, discuss urine pH and your prevention plan with your clinician before using orange juice to try to make urine more alkaline. If you have diabetes, consider the carbohydrate in juice when planning drinks. Orange juice is not a substitute for prescribed potassium citrate or another stone treatment.

Children and pregnant people with suspected kidney stones should be assessed by a clinician rather than relying on dietary remedies. Anyone with a new or recurrent suspected stone should seek medical advice, especially if symptoms persist or the stone type is unknown.

Go to an emergency department if stone symptoms occur with fever or chills, if you cannot urinate, or if you have severe pain or persistent vomiting. An infection combined with a urinary blockage can be an emergency.