Living with Renal Lithiasis

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Renal lithiasis and nutrition

Diet is a very important factor in preventing the formation of kidney stones, especially if you have had them in the past. There are some general recommendations to prevent them from occurring and specific recommendations to avoid the most common ones, according to their composition: calcium oxalate and uric acid.

What is the best diet for people with kidney stones?

Calcium oxalate lithiasis

Bottle with correct calcium drink

Ensure you take in a sufficient amount of calcium each day. There is a relationship between the recommended daily intake of calcium in the diet and reduced stone formation. This is because calcium decreases the absorption of oxalate in the intestine and this is eliminated in the faeces, making the possibility of producing calcium oxalate stones smaller. This is why, contrary to what you might think, it is very important to ensure the recommended daily intake of calcium per day with foods such as dairy.

Nut allergy

Avoid foods high in oxalate such as spinach, chard, rhubarb, wheat bran, walnuts, peanuts, chocolate, tea, and cola-type drinks. 


Do not take vitamin C and D supplements without a prescription. Vitamin C (ascorbic acid) is metabolised into oxalate, so it should not be taken as a supplement as the amount this provides is exponentially higher than the recommended daily dose. You can, and should, eat foods rich in vitamin C, such as oranges, lemons, and so on, as these also provide citrate, which reduces the crystallisation of calcium with other components. On the other hand, vitamin D promotes the absorption of calcium in the intestine, thereby reducing the possibility of it binding to oxalate in the intestine.

Sugar-sweetened beverage crossed out

Do not consume foods containing xylitol. The body converts this sweetener into oxalate. 

Scale with a down arrow indicating a weight loss

Avoid sudden weight loss or high-intensity physical exercise to prevent situations of muscle mass deterioration, as this increases the amount of uric acid in the body.

Pie, meat and sausage

Avoid foods high in purines. These include offal, meat extract or broth, red meat, sausages, seafood, blue fish and crustaceans.

Juice and fruit bricks

Do not eat foods containing fructose as a sweetener. This sugar, when consumed in excess, increases uric acid in the blood. Diet drinks and juices, for example, can contain large quantities of this sugar.

A pitcher of beer and a Martini or cocktail glass

Do not consume alcoholic drinks. Alcohol increases uric acid in the blood and is therefore not recommended in these situations. Drinks such as beer and highly alcoholic drinks should particularly be avoided.

The importance of stones composition

Substantiated information by:

Bárbara Romano Andrioni
Pilar Luque

Published: 16 November 2020
Updated: 16 November 2020

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