Effects of tea consumption on renal function in a metropolitan Chinese population: the Guangzhou biobank cohort study
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OBJECTIVE: Green tea consumption has been associated with many prophylactic health benefits. This study examined for the first time associations between tea consumption and renal function in a Chinese population.
DESIGN AND METHODS: Cross-sectional baseline data including demographics, and lifestyle and weekly consumption of green, black, and oolong tea were analyzed from 12,428 ambulatory subjects aged 50 to 85 years (67.3% female) that were randomly selected from the membership list of a community social and welfare association in Guangzhou, China.
INTERVENTION: Associations between tea consumption and renal function were assessed using regression analyses to adjust for potential confounding factors.
MAIN OUTCOME MEASURE: Renal function was assessed using the estimated glomerular filtration rate (eGFR) and in a subcohort of 1,910 participants using a spot urinary albumin-to-creatinine ratio.
RESULTS: Six thousand eight hundred and seventy-two participants drank at least 1 type of tea. Oolong tea consumption was negatively associated with eGFR (β-coefficient -0.019, P = .025), but in a gender-stratified analysis this was not the case. In men, black tea was positively associated with eGFR (β-coefficient 0.037, P = .013), but not in women (β-coefficient -0.002, P = .856). Otherwise, no statistically significant consistent associations between the measures of renal function and consumption of green tea, black tea, or oolong tea individually or total tea consumption were identified.
CONCLUSION: Overall there was no clear evidence to suggest any consistent association between renal function and tea consumption in this large population-based study of older Chinese individuals.
|Number of pages||6|
|Journal||Journal of Renal Nutrition|
|Publication status||Published - Jan 2014|
- Aged, Aged, 80 and over, Albuminuria, Asian Continental Ancestry Group, China, Cohort Studies, Creatinine, Cross-Sectional Studies, Female, Glomerular Filtration Rate, Humans, Kidney, Life Style, Male, Middle Aged, Regression Analysis, Risk Factors, Tea