Diet Guide
Low Oxalate Diet
Oxalate is a natural compound found in many plant foods. In the kidneys, oxalate can bind with calcium to form calcium oxalate stones — the most common type of kidney stone. A low oxalate diet reduces stone recurrence risk.
Why oxalate matters
Oxalate is produced by the body and also absorbed from food. When oxalate levels in the urine are high (hyperoxaluria), it combines with calcium to form crystals that can grow into kidney stones. Calcium oxalate stones account for approximately 80% of all kidney stones.
Most patients with calcium oxalate stones are advised to limit oxalate to less than 100 mg per day. Staying well hydrated (2–3 liters of water daily) is equally important — it dilutes urine and reduces crystal formation.
Do not restrict calcium
Contrary to intuition, eating adequate calcium with meals actually reduces oxalate absorption by binding oxalate in the gut before it reaches the kidneys. Do not restrict dietary calcium unless specifically instructed by your nephrologist.
Lower oxalate — good choices
• Apples, bananas, cherries, grapes
• Cantaloupe, watermelon
• Cauliflower, cabbage, peas
• Mushrooms, onions
• White rice, white bread, pasta
• Eggs, meat, poultry, fish
• Dairy products (milk, cheese, yogurt)
• Avocado
• Corn, green beans
• Lemon juice (may help prevent stones)
High oxalate — limit or avoid
• Spinach (very high)
• Rhubarb (very high)
• Beets and beet greens
• Swiss chard
• Nuts (especially almonds, cashews, peanuts)
• Chocolate and cocoa
• Tea (black and green)
• Wheat bran and whole wheat
• Sweet potatoes
• Soy products (tofu, soy milk)
Practical tips
Drink plenty of water
Aim for 2–3 liters (about 8–12 cups) of water daily. Dilute urine is the single most effective way to prevent kidney stones. Lemonade made with real lemon juice also helps.
Eat calcium with meals
Include a calcium-rich food (milk, yogurt, cheese) with meals that contain oxalate. Calcium binds oxalate in the gut, reducing how much is absorbed into the blood.
Boil high-oxalate vegetables
Boiling vegetables like spinach and beets and discarding the water can reduce oxalate content by 30–50%.
Limit vitamin C supplements
The body converts vitamin C to oxalate. Avoid high-dose vitamin C supplements (above 500 mg/day) unless directed by your doctor.
Disclaimer: This guide is for general educational purposes only. Dietary needs vary by individual. Always consult your nephrologist or a registered renal dietitian before making changes to your diet.
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