After a run-in period of 3 weeks patients are allocated into 2 groups. The Oxalate restricted group is prescribed an oxalate restricted diet. They are instructed to avoid oxalate-rich foods such as spinach, rhubarb, beets, chocolate, cereals, nuts, tea, wheat bran, and strawberries and to drink water in amounts of roughly 2 L during cold weather and 3 L during warm/hot weather.

The second group is asked to follow a calorie-controlled DASH diet plan. DASH is an eating pattern recommended by the 2005 Department of Health and Human Services Dietary Guidelines for Americans as a model of healthy eating for the majority of individuals in the population. This group eats a diet which includes higher fruit, vegetables, and low-fat dairy products and lower in saturated fat, total fat, and cholesterol, containing more whole grains and fewer refined grains, sweets, and red meat.

Nephrolithiasis

When the first set of urine samples confirmed hyperoxaluria (urine oxalate>32.8), the patients will enter the study. After a run-in period of 3 weeks patients are allocated into 2 groups that I already explained in the arms section.The patients are visited in the beginning, after 6 weeks and at the end of the study

diet

Urology and Nephrology Research Center, Shahid Beheshti University of Medical Sciences

Labbafinejad Hospital

Comparison of DASH With Oxalate Restricted Diet on Urine in Recurrent Stone Formers With Hyperoxaluria

Study of the Effects of DASH Style Diet and Oxalate Restricted Diet on Urinary Supersaturation Which is a Major Predisposing Factor for Nephrolithiasis

24-h urine including urine oxalate is collected 2 times before study visits at baseline, and 2 times at the end of the study which is 2 months.

Urinary supersaturation is calculated before study visits at baseline, and at the end of the study which is 2 months.

Nazanin Noori

MD, PhD

Shahid Beheshti University of Medical Sciences

The term "water therapy" refers to an abundant intake of water with a low mineral and low sodium content (at least 2 litres in winter and 3 in summer).

low salt diet refers to a salt intake of 4 g/day

Urinary Stones

Hypertension

Overweight

Obesity

low salt diet

abundant intake of water with a low mineral and low sodium content (at least 2 litres in winter and 3 in summer).

hyperoxaluria/potassio

Comparison of DASH With Oxalate Restricted Diet on Urine in Recurrent Stone Formers With Hyperoxaluria

The Links Between Water and Salt Intake, Body Weight, Hypertension and Kidney Stones: a Difficult Puzzle

Genetic Study of Nephrolithiasis in Gouty Diathesis

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