Tea consumption is not associated with reduced plasma folate concentration among chinese pregnant women

Liu, Jufen; Jin, Lei; Zhang, Yali; Zhang, Le; Li, Zhiwen; Wang, Linlin; Ye, Rongwei; Ren, Aiguo

doi:10.1002/bdra.23398

Cited by 5 publications

(4 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We used multiple linear regression to evaluate the partial correlation coefficients with 95 % CI after adjusting for confounding factors. These factors include mentioned in previous studies (age, education, delivery status, FA supplement, smoking, BMI and concentration of dietary folate adjusted by energy) (10,11,13) , imbalanced between tea consumption and no tea consumption group (ethnicity, delivery status and drinking), and other factor we are interested in may affect plasma folate levels (oral contraceptives). Then, we conducted a stratified analysis of the subjects according to ethnic groups and tea types, and we performed the same multiple linear regression analysis in each group, after adjusting for confounding factors mentioned above.…”

Section: Discussionmentioning

confidence: 99%

“…An open-label randomised crossover study revealed that consumption of green or black tea was associated with a low serum folate level for healthy volunteers (9) . A cross-sectional survey showed no association between tea drinking and plasma folate concentrations in pregnant Chinese women with high and low prevalence of NTD (10) . However, most studies did not take into account the effects of dietary folate intake, despite its being the most important factor for folate levels in the body other than FA supplement.…”

mentioning

confidence: 96%

See 1 more Smart Citation

Association between tea drinking and plasma folate concentration among women aged 18–30 years in China

Jia

Ren

Zhang

et al. 2020

Public Health Nutr.

Self Cite

View full text Add to dashboard Cite

Objective: Association was found between tea and neural tube defects. However, few studies investigated the relationship between tea consumption and blood folate levels. We aimed to investigate the association between tea consumption and plasma folate concentrations among women aged 18–30 years in different ethnicities of China. Design: Data were obtained from a national cross-sectional study conducted from 2005 to 2006 of women aged 18–30 years in China. Socio-demographic characteristics and lifestyle were obtained from a questionnaire. Dietary folate intake was determined by 24-h dietary recall. Plasma folate concentrations were measured by a microbiological assay. Multiple linear regression model was used to calculate partial regression coefficients after adjusting for confounding factors. Setting: Nine provinces or autonomous regions in China. Participants: A total of 2932 women aged 18–30 years in China. Results: After stratifying by ethnicity and tea type, tea consumption was significantly positively associated with plasma folate levels in Han women who drank unfermented tea weekly (β = 0·067, and P = 0·037) or daily (β = 0·119, and P = 0·031) and in Uighur women who drank fermented tea weekly (β = 0·325, and P = 0·028). For women who drank unfermented tea in Han ethnicity, weekly and daily tea drinkers had 6·77 % (95 % CI: 6·36 %, 7·21 %) and 7·13 % (95 % CI: 6·40 %, 7·96 %) increase in plasma folate concentration compared with no tea drinkers. Conclusions: There is a suggestion of possible positive association between unfermented tea drinking in Han ethnicity and plasma folate concentrations, for Chinese women aged 18–30 years. The relationship between tea drinking in other ethnic groups and plasma folate still needs to be further explored.

show abstract

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 96%

Association between tea drinking and plasma folate concentration among women aged 18–30 years in China

Jia

Ren

Zhang

et al. 2020

Public Health Nutr.

Self Cite

View full text Add to dashboard Cite

show abstract

“… 23 Notably, studies of the association between maternal tea intake during pregnancy and serum folate levels have been conducted in Japan ( n = 254) 24 and China ( n = 1,724). 25 In the former study, serum folate levels were lower among subjects who consumed large amounts of green and oolong teas, and the authors suggested that catechins might affect folate absorption. The latter study, however, failed to find an association between tea (green, oolong, black, and jasmine) intake and folate levels.…”

Section: Introductionmentioning

confidence: 94%

“…The latter study, however, failed to find an association between tea (green, oolong, black, and jasmine) intake and folate levels. 25 Despite the existence of these few studies, research concerning the associations of serum folate with caffeinated beverage intake (including green and oolong teas) and catechin levels remains limited. Therefore, the present study aimed to determine these associations in a Japanese population of pregnant women.…”

Section: Introductionmentioning

confidence: 99%

Association Between Serum Folate Levels and Caffeinated Beverage Consumption in Pregnant Women in Chiba: The Japan Environment and Children’s Study

Otake

Sakurai

Watanabe

et al. 2018

Journal of Epidemiology

View full text Add to dashboard Cite

BackgroundSeveral studies have reported the adverse effects of caffeine intake during pregnancy on fetal health. However, the effects of caffeine intake from green and oolong teas has not been investigated, despite the considerable consumption of these teas in Japan and the potential inhibitory effects of catechins—chemicals present at relatively high levels in green and oolong teas—on folic acid absorption. The potential associations of serum folate levels with caffeinated beverage consumption and catechin levels remain largely unstudied. The present study aimed to determine these associations in pregnant Japanese women.MethodsPregnant women (n = 2,701) not receiving folate supplementation were enrolled at the Chiba Unit Center, a regional site of the Japan Environment and Children’s Study (JECS). Serum folate levels were measured using an Access folate assay kit, and nutrient and caffeine intakes were assessed using a self-administered food frequency questionnaire that was previously evaluated in Japanese populations.ResultsThe low and normal serum folate groups reported caffeine intakes of 42.3 mg/1,000 kcal and 34.4 mg/1,000 kcal, respectively, and tannin intakes of 40.8 mg/1,000 kcal and 36.3 mg/1,000 kcal, respectively. Multiple regression analyses revealed negative associations of serum folate levels with caffeine and tannin intakes and a positive association between serum folate levels and dietary folate intake.ConclusionsConsidering the negative associations of caffeine and tannin levels with serum folate levels, pregnant women should consume caffeinated beverages, such as coffee and green/oolong teas, with caution.

show abstract

Green tea

Coppock¹,

Dziwenka²

2021

Nutraceuticals

View full text Add to dashboard Cite

Tea consumption is not associated with reduced plasma folate concentration among chinese pregnant women

Abstract: Low level of tea drinking is not associated with decreased plasma folate concentration in the Chinese populations with high and low prevalence of NTDs.

Cited by 5 publications

References 27 publications

Association between tea drinking and plasma folate concentration among women aged 18–30 years in China

Association between tea drinking and plasma folate concentration among women aged 18–30 years in China

Association Between Serum Folate Levels and Caffeinated Beverage Consumption in Pregnant Women in Chiba: The Japan Environment and Children’s Study

Green tea

Contact Info

Product

Resources

About