Effect of Black Tea Consumption on Urinary Risk Factors for Kidney Stone Formation.

Roswitha Siener,Albrecht Hesse

doi:10.3390/nu13124434

Roswitha Siener, Albrecht Hesse

Open Access

https://doi.org/10.3390/nu13124434

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Journal: Nutrients	Publication Date: Dec 11, 2021
Citations: 12	License type: CC BY 4.0

Affiliation: University Hospital Bonn

Abstract

Copious fluid intake is the most essential nutritional measure in the treatment of urolithiasis, and is suggested to be a protective factor in the primary prevention of urinary stone formation. Although the intake of black tea contributes to daily fluid intake, the high oxalate content could outweigh the beneficial effect of urine dilution. The present study investigated the effect of black tea consumption on urinary risk factors for kidney stone formation. Ten healthy men received a standardized diet for a period of ten days. Subjects consumed 1.5 L/day of fruit tea (0 mg/day oxalate) during the 5-day control phase, which was replaced by 1.5 L/day of black tea (86 mg/day oxalate) during the 5-day test phase. Fractional and 24-h urines were obtained. The intake of black tea did not significantly alter 24-h urinary oxalate excretion. Urinary citrate, an important inhibitor of calcium stone formation, increased significantly, while the relative supersaturation of calcium oxalate, uric acid, and struvite remained unchanged. No significantly increased risk for kidney stone formation could be derived from the ingestion of black tea in normal subjects. Further research is needed to evaluate the impact of black tea consumption in kidney stone patients with intestinal hyperabsorption of oxalate.

Highlights

Urinary stone disease is a significant economic burden on healthcare systems, which is likely to increase with time [1,2,3]
Urinary excretion of citrate increased, while urinary oxalate excretion and the relative supersaturation of calcium oxalate, uric acid, and struvite remained unchanged after the intake of black tea
The caffeine intake with black tea did not lead to significant changes in 24-h urine volume, specific gravity, or mineral excretion compared to the control

Summary

Introduction

Urinary stone disease is a significant economic burden on healthcare systems, which is likely to increase with time [1,2,3]. The prevalence and incidence of urolithiasis has increased globally over the last several decades [4]. The prevalence of urinary stones was reported to be 5% in Germany and 10% in the United States [5,6]. Low urine volume is a major risk factor for kidney stone formation [9]. Copious fluid intake is the most essential nutritional measure in the treatment of urolithiasis, regardless of stone type and specific risk factors for stone formation [9,10,11]. Increased fluid intake was found to be associated with a reduced risk of incident nephrolithiasis in both women and men [12,13,14,15,16]

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