Impact of low-oxalate diet on hyperoxaluria among patients suffering from nephrolithiasis

Low-oxalate diets are useful for treating hyperoxaluria in nephrolithiasis patients. This study was unique in examining how a low-oxalate diet in addition to a standard diet affected hyperoxaluria and renal function tests in nephrolithiasis patients. The effects of a low-oxalate diet were analyzed by different biochemical tests, that is, anthropometric measurements, blood oxalate test, renal function test, electrolyte profile test, and 24 h urine analysis. For this purpose, 112 patients were divided into 2 groups: Group T₁ (Conventional diet) and Group T₂ (Low-Oxalate diet) for 8 weeks. Each group was tested at the initiation and end of the study. Using SPSS, the obtained data from each parameter were statistically analyzed. The results showed that a low-oxalate diet had a positive effect on patients suffering from nephrolithiasis. Furthermore, after treatment, anthropometric measurement weight (kg) among the control group (T₁) was 100.45 ± 5.65 and the treatment group (T₂) was 79.71 ± 9.48 kg. The effect of low-oxalate diet on renal function test: creatinine (g/d) among T₁ was 2.08 ± 0.86 and T₂ was 1.17 ± 0.13, uric acid(mg/d) among T₁ was 437.04 ± 24.20 and T₂ was 364.61 ± 35.99, urinary oxalate (mg/d) among T₁ was 76.84 ± 10.33 and T₂ was 39.24 ± 1.51, respectively. Sodium (mEq/d) among T₁ was 156.72 ± 6.37 and T₂ was 159.84 ± 6.31, potassium (mEq/d) among T₁ was 69.91 ± 15.37 and T₂ was 89.21 ± 6.31, phosphorus (g/d) among T₁ was 0.96 ± 0.07 and T₂ was 0.34 ± 0.27, respectively. This study demonstrated that nephrolithiasis patients with hyperoxaluria benefit from low-oxalate diets. Hyperoxaluria patients should eat a low-oxalate diet to use oxalate without affecting metabolism and eliminate it from the kidney without stones.