Green tea consumption and cognitive function: a cross-sectional study from the Tsurugaya Project

Objectives: Several lines of emerging pharmacological and epidemiological evidence imply that overall risks related to COVID-19 may be reduced by green tea catechins. Therefore, it may be expected that: (i) higher green tea consumption is associated with lower COVID-19 morbidity and/or mortality; (ii) countries with higher per/capita green tea consumption would be less affected by COVID-19. The aim of this study was to assess the second possibility. Study design: This was a cross-sectional study. Methods: Among countries with at least 3 million population (n=134), countries with relatively high (above 150 g) per/capita green tea consumption have been tentatively identified (n=21); (ii) normalized to population values of COVID-19 cases (morbidity) and deaths (mortality) for groups of countries with high and low per/capita green tea consumption were compared. Results: Striking differences in COVID-19 morbidity (and mortality) between groups of countries with higher and lower green tea consumption. The differences were still observed after the adjustment for the onset of the disease. Besides, preliminary analysis using multiple linear regression approach suggests that the associations are present at the level of individual countries. Conclusion: Evidence supporting the idea that green tea constituents could reduce overall risks related to COVID-19 has been obtained. The results are promising and are in line with emerging evidence from other studies including pharmacological ones. Nevertheless, because of limitations of this study the idea still should be considered as a hypothesis requiring further assessment.

Download Full-text

Is the Association between Green Tea Consumption and the Number of Remaining Teeth Affected by Social Networks?: A Cross-Sectional Study from the Japan Gerontological Evaluation Study Project

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph17062052 ◽

2020 ◽

Vol 17 (6) ◽

pp. 2052

Author(s):

Manami Hoshi ◽

Jun Aida ◽

Taro Kusama ◽

Takafumi Yamamoto ◽

Sakura Kiuchi ◽

...

Keyword(s):

Social Networks ◽

Green Tea ◽

Evaluation Study ◽

Cross Sectional Study ◽

Network Size ◽

Tea Consumption ◽

Sectional Study ◽

Cross Sectional ◽

The Past ◽

Social Network Size

Consumption of green tea without sugar, as well as social networks, are associated with a lower risk of tooth loss. There is a possibility of confounding both factors because tea is often drunk with friends. Therefore, the present study aimed to examine whether green tea consumption is beneficially associated with the number of remaining teeth, while considering social networks. This cross-sectional study was based on the Japan Gerontological Evaluation Study (JAGES) in 2016. Self-administered questionnaires containing questions about green tea consumption were mailed to 34,567 community-dwelling residents aged ≥ 65 years. We used the number of remaining teeth as a dependent variable, and green tea consumption and the number of friends met over the past month (social network size) as independent variables. Linear regression models with multiple imputation were used. A total of 24,147 people responded (response rate = 69.9%), and 22,278 valid data were included into our analysis. Participants’ mean age was 74.2 years (standard deviation = 6.3), and 45.9% were men. Among the participants, 52.2% had ≥ 20 teeth, 34.2% drank 2–3 cups of green tea per day, and 32.6% met ≥ 10 people over the past month. After adjusting for all potential confounders, both higher green tea consumption and a larger social network size were associated with more remaining teeth (both p for trend < 0.001). The association of green tea was greater among those with smaller social networks (p for interaction < 0.05). The protective association of green tea was remarkable among people with smaller social networks.

Download Full-text

Green tea consumption and serum lipid profiles: A cross-sectional study in Northern Kyushu, Japan

Preventive Medicine ◽

10.1016/0091-7435(92)90060-u ◽

1992 ◽

Vol 21 (4) ◽

pp. 526-531 ◽

Cited By ~ 83

Author(s):

Suminori Kono ◽

Koichi Shinchi ◽

Nariaki Ikeda ◽

Fumio Yanai ◽

Koji Imanishi

Keyword(s):

Green Tea ◽

Serum Lipid ◽

Cross Sectional Study ◽

Lipid Profiles ◽

Tea Consumption ◽

Sectional Study ◽

Cross Sectional

Download Full-text

Fine or Gross Motor Index as a Simple Tool for Predicting Cognitive Impairment in Elderly People: Findings from The Irish Longitudinal Study on Ageing (TILDA)

Journal of Alzheimer s Disease ◽

10.3233/jad-210704 ◽

2021 ◽

pp. 1-8

Author(s):

Xiao Liu ◽

Ayiguli Abudukeremu ◽

Yuan Jiang ◽

Zhengyu Cao ◽

Maoxiong Wu ◽

...

Keyword(s):

Cohort Study ◽

Cognitive Impairment ◽

Longitudinal Study ◽

Cognitive Function ◽

Prospective Cohort Study ◽

Prospective Cohort ◽

Cross Sectional Study ◽

Sectional Study ◽

Cross Sectional ◽

Simple Tool

Background: Several kinds of motor dysfunction can predict future cognitive impairment in elderly individuals. However, the ability of the fine motor index (FINEA) and gross motor index (GROSSA) to predict the risk of cognitive impairment has not been assessed. Objective: We investigated the associations between FINEA/GROSSA and cognitive impairment. Methods: The data of 4,745 participants from The Irish Longitudinal Study on Ageing (TILDA) were analyzed. Cognitive function was assessed using the Mini-Mental State Examination (MMSE). We first assessed the correlation between the FINEA GROSSA and MMSE in a cross-sectional study. Then, we further investigated the predictive role of the incidence of cognitive impairment in a prospective cohort study. Results: We found that both FINEA and GROSSA were negatively correlated with MMSE in both the unadjusted (FINEA: B = –1.00, 95%confidence intervals (CI): –1.17, –0.83, t = –11.53, p < 0.001; GROSSA: B = –0.85, 95%CI: –0.94, –0.76, t = –18.29, p < 0.001) and adjusted (FINEA: B = –0.63, 95%CI: –0.79, –0.47, t = –7.77, p < 0.001; GROSSA: B = –0.57, 95%CI: –0.66, –0.48, t = –12.61, p < 0.001) analyses in a cross-sectional study. In a prospective cohort study, both high FINEA and high GROSSA were associated with an increased incidence of cognitive function impairment (FINEA: adjusted odds ratios (OR) = 2.35, 95%CI: 1.05, 5.23, p = 0.036; GROSSA adjusted OR = 3.00, 95%CI: 1.49, 6.03, p = 0.002) after 2 years of follow-up. Conclusion: Higher FINEA and GROSSA scores were both associated with an increased incidence of cognitive impairment. FINEA or GROSSA might be a simple tool for identifying patients with cognitive impairment.

Download Full-text

Impact of Coffee/Green Tea/Soft Drink Consumption on the Risk of Hyperuricemia: A Cross-Sectional Study

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph18147299 ◽

2021 ◽

Vol 18 (14) ◽

pp. 7299

Author(s):

Joong Seob Lee ◽

Tae Jun Kim ◽

Sung Kwang Hong ◽

Chanyang Min ◽

Dae Myoung Yoo ◽

...

Keyword(s):

Green Tea ◽

Reference Group ◽

Smoking Status ◽

Soft Drink ◽

Sociodemographic Factors ◽

Cross Sectional Study ◽

Sectional Study ◽

Cross Sectional ◽

Soft Drink Consumption ◽

Increased Risk

This cross-sectional study aimed to investigate the association between hyperuricemia and the frequency of coffee, tea, and soft drink consumption, based on data from the Korean Genome and Epidemiology Study (KoGES) (2004–2016). We used the KoGES health examinee data, obtained from urban residents aged ≥ 40 years. Information on the participants’ medical history, nutrition (total calorie, protein, fat, and carbohydrate intake), frequency of alcohol consumption, smoking status, household income, and frequency of coffee/green tea/soft drink intake was collected. A logistic regression model was used to analyze the data. Subgroup analyses were performed according to the participant’s age and sex. Among 173,209 participants, there were 11,750 and 156,002 individuals with hyperuricemia and non-hyperuricemia controls, respectively. In an adjusted model, frequent coffee and green tea consumption did not increase the risk of hyperuricemia, compared to the “no intake” reference group. However, an adjusted odds ratio of hyperuricemia was 1.23 (95% confidence interval, 1.11–1.35, p < 0.001) for participants who reported consuming soft drinks ≥ 3 times per day, compared to the respective “no drink” reference group. Even after adjusting for nutritional and sociodemographic factors, frequent soft drink intake was associated with an increased risk of hyperuricemia. Meanwhile, neither coffee nor green tea intake was associated with an increased risk of hyperuricemia.

Download Full-text