Kidney Stone Prevention Diet: Foods to Eat and Avoid

By Dr. Jatin Kothari in Nanavati Max Institute of Renal Sciences & Transplant , Kidney Stone Clinic

Apr 24 , 2023 | 4 min read

What is a Kidney Stone?

A kidney stone is a hard, crystalline deposit that forms in the kidney or urinary tract. They can range in size from a grain of sand to a golf ball and can cause severe pain when passing through the urinary system. Kidney stones can be caused by a variety of factors, including dehydration, diet, and genetics.

Types of Kidney Stones

1. Calcium Oxalate Stones: Most Common Stones Calcium oxalate stones are the most common type of kidney stone.

2. Uric Acid Stones: Another Common Stone Uric acid stones are another common type of kidney stone.

What is The Most Important Factor to Prevent Kidney Stone Formation?

The most important factor to prevent kidney stone formation is adequate hydration. Drinking enough water and fluids throughout the day can help prevent kidney stones from forming by flushing out the urinary system and diluting the concentration of minerals and other substances that can contribute to stone formation. It is generally recommended to drink at least eight cups of water per day, but individual needs may vary depending on factors such as activity level and climate. Additionally, a balanced diet that is low in sodium and animal protein and high in fruits, vegetables, and whole grains can help reduce the risk of developing kidney stones.

Kidney Stone Diet Recommendations

Following a kidney stone diet can help reduce the risk of developing new kidney stones. The diet typically includes drinking plenty of water and fluids throughout the day and limiting the intake of foods and beverages that can contribute to stone formation, such as animal protein, sodium, and oxalate-rich foods like spinach, chocolate, and nuts. In addition, the diet may recommend increasing the intake of fruits and vegetables, which are rich in potassium and citrate, substances that can help prevent stone formation. Depending on the type of kidney stone, specific dietary recommendations may vary, and it is important to consult with a urology specialist or registered dietitian to develop an individualized plan.

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Kidney Stone Types

1. Calcium Oxalate Stones: Most common stones

Calcium oxalate stones are the most common type of kidney stone, accounting for around 75-80% of all cases. These stones form when calcium combines with oxalate in the urine, creating a hard crystalline structure that can range in size from a grain of sand to a golf ball. Oxalate is a naturally occurring substance found in many foods, including leafy green vegetables, chocolate, and nuts. People who are prone to developing calcium oxalate stones may benefit from limiting their intake of these foods, as well as reducing their sodium and animal protein intake.

2. Uric Acid Stones: Another common stone

Uric acid stones are another common type of kidney stone, accounting for around 5-10% of cases. These stones form when there is too much uric acid in the urine, which can be caused by a variety of factors, including gout, certain medications, and a diet high in purines (substances found in animal protein). Uric acid stones can often be prevented by making dietary changes, such as reducing the intake of high-purine foods like red meat and seafood and increasing the intake of fluids to help flush out the urinary system. In some cases, medications may be prescribed to help prevent the formation of new stones.

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Will it Help or Hurt to Take a Vitamin or Mineral Supplement?

Whether taking a vitamin or mineral supplement will help or hurt in preventing kidney stones depends on the individual's health status and the type of stone they have. Some supplements, such as vitamin C and calcium, can increase the risk of stone formation if taken in excess, while others like magnesium may help reduce the risk. It is important to consult with a healthcare provider or registered dietitian before taking any supplements to determine if they are appropriate for the individual's needs.

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Kidney Stone Diet Plan: What to Eat and Avoid

1. Drink Plenty of Fluids: 2–3 Quarts/Day

Staying hydrated is important for preventing kidney stones.

2. Eat Enough Dietary Calcium

Adequate calcium intake is important for reducing the risk of kidney stone formation.

3. Eat More Fresh, Non-Processed Foods

A kidney stone diet should be rich in fresh, non-processed foods like fruits, vegetables.

4. Limit the Intake of Meat

Animal-based sources of protein can be high in purines.

5. Increase Intake of Citrus Fruits and Juices

Citrus fruits like oranges, lemons, and grapefruits are high in citrate.

6. Limit Foods High in Oxalate

Oxalate is a substance found in many foods that can increase the risk.

7. Eat a Moderate Amount of Protein

Consuming too much protein can increase the risk of developing kidney stones.

8. Avoid High Salt Intake

An increase in sodium levels within the body increases calcium level.

9. Avoid Extra Calcium Supplements

When it comes to preventing kidney stones, it's important to get enough calcium in the diet.

10. Avoid High Doses of Vitamin C Supplements

Vitamin C is an important nutrient, but taking high doses of supplements can increase risk.

Conclusion

Preventing kidney stones starts with staying well-hydrated and making smart dietary choices. Limiting salt, animal protein, oxalate-rich foods, and excess supplements—especially calcium and vitamin C—can reduce the risk. Eating more fresh fruits, vegetables, and foods rich in citrate helps prevent stone formation. Since different stone types need different approaches, it's best to consult a doctor or dietitian for a personalized plan.