Evidence map›Paper›PMID 34959987›Full record

ArticleNutrients2021

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

Roswitha Siener, Albrecht Hesse

Open access · goldAbstract read
In one paragraph

Article in Nutrients, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
17citing papers in PubMed, 2 pooled it
2.6field-weighted citation impact, top 9% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

17 citing papers in PubMed, 2 syntheses or guidelines pooled it, 25 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
  3. Urolithiasis in patients with cancer.Nature reviews. Urology · 2026
    Review
  4. Review
  5. Article
  6. Article
  7. Article
  8. Article
  9. Review
  10. Impact of diet on renal stone formation.Journal of family medicine and primary care · 2024
    Review
  11. Oxalates: Dietary Oxalates and Kidney Inflammation: A Literature Review.Integrative medicine (Encinitas, Calif.) · 2024
    Review
  12. Current Dietary and Medical Prevention of Renal Calcium Oxalate Stones.International journal of general medicine · 2024
    Review
  13. Kidney Stone Prevention.Advances in nutrition (Bethesda, Md.) · 2023
    Review
  14. Review
  15. Article
  16. Article
  17. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

2 authors at 1 institution in 1 country.

Roswitha SienerDepartment of Urology, University Stone Center, University Hospital Bonn, 53127 Bonn, Germany.
Albrecht HesseDepartment of Urology, University Stone Center, University Hospital Bonn, 53127 Bonn, Germany.
University Hospital Bonn · DE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

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.

Indexed as

TeaAdultCitric AcidDrinkingEatingHumansKidney CalculiMaleOxalatesRisk FactorsTime FactorsUric AcidYoung AdultCitric AcidOxalatesTeaUric Acidblack teacaffeinehyperoxaluriakidney stonenephrolithiasisoxalateteaurinary stone formationurolithiasis

Identifiers

PMID34959987
PMCPMC8708000
OpenAlexW4200309226

What OpenQuestion holds

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LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.