scholarly journals Effects of black tea consumption and caffeine intake on depression risk in black tea consumers

2021 ◽  
Vol 21 (2) ◽  
pp. 858-865
Author(s):  
Esma Asil ◽  
Mustafa Volkan Yılmaz ◽  
Hulya Yardimci
Keyword(s):  
Beck Depression Inventory ◽  
Multivariate Regression ◽  
Black Tea ◽  
Caffeine Intake ◽  
Protective Effects ◽  
Tea Consumption ◽  
Regression Analyses ◽  
Depression Risk ◽  
Depression Status ◽  
The Mean

Background: The aim of this study was to compare black tea consumption and caffeine intake with depression status. Subjects and Methods: This study was conducted on 491 adults (M:169, F:322). The average daily caffeine intake of individuals was calculated using the amounts of caffeinated beverages they consumed daily and the caffeine contents of these beverages. The participants’ depression status was determined using the Beck Depression Inventory (BDI). All of the research data were evaluated using STATA. Results: According to BDI scores, 30.1% of participants had depression. Black tea was consumed by all of the partici- pants and also had the highest consumption level of 620.1±90.4mL and the mean caffeine intake of the participants was 629.5±418.8 mg. Multivariate regression analyses showed that consuming more than 1 cup was protective against depression up to 4 cups. Moreover, a 450-600 mg caffeine intake also reduces the risk of depression than lower or higher intake levels. Conclusion: Our study suggests that black tea consumption up to 4 cups and caffeine intake between 450-600 mg can help protect against depression. Further studies are needed to better understand the protective effects of black tea and caffeine on depression. Keywords: Caffeine; black tea; beck depression inventory; depression.

scholarly journals Mechanisms Underlying the Anti-Depressive Effects of Regular Tea Consumption

Nutrients ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1361 ◽  
Author(s):  
Dylan O’Neill Rothenberg ◽  
Lingyun Zhang
Keyword(s):  
Antidepressant Activity ◽  
Black Tea ◽  
Tea Consumption ◽  
Major Pathway ◽  
Depression Risk ◽  
Microbiome Diversity ◽  
Antidepressant Effects ◽  
Bdnf Signaling ◽  
Risk Ratios

This article is a comprehensive review of the literature pertaining to the antidepressant effects and mechanisms of regular tea consumption. Meta-data supplemented with recent observational studies were first analyzed to assess the association between tea consumption and depression risk. The literature reported risk ratios (RR) were 0.69 with 95% confidence intervals of 0.62–0.77. Next, we thoroughly reviewed human trials, mouse models, and in vitro experiments to determine the predominant mechanisms underlying the observed linear relationship between tea consumption and reduced risk of depression. Current theories on the neurobiology of depression were utilized to map tea-mediated mechanisms of antidepressant activity onto an integrated framework of depression pathology. The major nodes within the network framework of depression included hypothalamic-pituitary-adrenal (HPA) axis hyperactivity, inflammation, weakened monoaminergic systems, reduced neurogenesis/neuroplasticity, and poor microbiome diversity affecting the gut–brain axis. We detailed how each node has subsystems within them, including signaling pathways, specific target proteins, or transporters that interface with compounds in tea, mediating their antidepressant effects. A major pathway was found to be the ERK/CREB/BDNF signaling pathway, up-regulated by a number of compounds in tea including teasaponin, L-theanine, EGCG and combinations of tea catechins and their metabolites. Black tea theaflavins and EGCG are potent anti-inflammatory agents via down-regulation of NF-κB signaling. Multiple compounds in tea are effective modulators of dopaminergic activity and the gut–brain axis. Taken together, our findings show that constituents found in all major tea types, predominantly L-theanine, polyphenols and polyphenol metabolites, are capable of functioning through multiple pathways simultaneously to collectively reduce the risk of depression.

scholarly journals Green tea consumption in everyday life and mental health

2005 ◽  
Vol 8 (8) ◽  
pp. 1300-1306 ◽  
Author(s):  
Mari Shimbo ◽  
Keiko Nakamura ◽  
Hui Jing Shi ◽  
Masashi Kizuki ◽  
Kaoruko Seino ◽  
...  
Keyword(s):  
Mental Health ◽  
Everyday Life ◽  
Green Tea ◽  
General Health Questionnaire ◽  
Black Tea ◽  
Population Based ◽  
Cross Sectional Study ◽  
Caffeine Intake ◽  
Tea Consumption ◽  
Cross Sectional

AbstractObjectiveGreen tea has been widely acknowledged in Japan to induce a pleasurable mental feeling. Recent laboratory studies have suggested positive psychological effects as a result of consuming green tea. The present study examined whether green tea consumption in everyday life in Japan is associated with positive mental health.DesignA cross-sectional study was performed in February–March 2002.Setting and subjectsThe subjects of the study consisted of a general population of 600 Japanese aged 20–69 years. Responses of 380 subjects, obtained by home-visit interview, were analysed. The questionnaire inquired about consumption of brewed green tea and other beverages, perceived mental health status, lifestyle and others. The 12-item General Health Questionnaire (GHQ 12) was used for the assessment of mental ill-health (GHQ score ≥4).ResultsAfter adjustments for age, area, perceived mental stress, lifestyle and daily caffeine intake, the consumption of brewed green tea was not statistically associated with any decrease in risk of mental ill-health among either males or females (odds ratio (OR) = 0.78, 95% confidence interval (CI) = 0.47–1.29 for males; OR = 0.77, 95% CI = 0.51–1.14 for females). Daily caffeine intake (100 mg) inclusive of green tea, black tea, coffee and other caffeine-containing beverages was associated with a higher risk of mental ill-health among females (OR = 1.26, 95% CI = 1.01–1.56).ConclusionsThe results provide population-based evidence on the consumption of brewed green tea in everyday life and mental health, together with information on consumption patterns of various beverages and lifestyles.

scholarly journals Timescale dependence of environmental controls on methane efflux from Poyang Hu, China

2017 ◽  
Vol 14 (8) ◽  
pp. 2019-2032 ◽  
Author(s):  
Lixiang Liu ◽  
Ming Xu ◽  
Renqiang Li ◽  
Rui Shao
Keyword(s):  
Wind Speed ◽  
Multivariate Regression ◽  
Stepwise Regression ◽  
Phosphorus Content ◽  
Regression Analyses ◽  
Diel Pattern ◽  
Environmental Controls ◽  
Positive Linear Correlation ◽  
The Mean ◽  
Methane Efflux

Abstract. Lakes are an important natural source of CH4 to the atmosphere. However, the multi-seasonal CH4 efflux from lakes has been rarely studied. In this study, the CH4 efflux from Poyang Hu, the largest freshwater lake in China, was measured monthly over a 4-year period by using the floating-chamber technique. The mean annual CH4 efflux throughout the 4 years was 0.54 mmol m−2 day−1, ranging from 0.47 to 0.60 mmol m−2 day−1. The CH4 efflux had a high seasonal variation with an average summer (June to August) efflux of 1.34 mmol m−2 day−1 and winter (December to February) efflux of merely 0.18 mmol m−2 day−1. The efflux showed no apparent diel pattern, although most of the peak effluxes appeared in the late morning, from 10:00 to 12:00 CST (GMT + 8). Multivariate stepwise regression on a seasonal scale showed that environmental factors, such as sediment temperature, sediment total nitrogen content, dissolved oxygen, and total phosphorus content in the water, mainly regulated the CH4 efflux. However, the CH4 efflux only showed a strong positive linear correlation with wind speed within 1 day on a bihourly scale in the multivariate regression analyses but almost no correlation with wind speed on diurnal and seasonal scales.

Use of Damage Control and the Open Abdomen in Combat

2013 ◽  
Vol 79 (8) ◽  
pp. 747-753 ◽  
Author(s):  
Benjamin Bograd ◽  
Carlos Rodriguez ◽  
Richard Amdur ◽  
Fred Gage ◽  
Eric Elster ◽  
...  
Keyword(s):  
Length Of Stay ◽  
Multivariate Regression ◽  
Injury Severity ◽  
Open Abdomen ◽  
Damage Control ◽  
Unit Length ◽  
Significant Risk ◽  
Hospital Length Of Stay ◽  
Study Cohort ◽  
Regression Analyses

Despite the well-documented use of damage control laparotomy (DCL) in civilian trauma, its use has not been well described in the combat setting. Therefore, we sought to document the use of DCL and to investigate its effect on patient outcome. Prospective data were collected on 1603 combat casualties injured between April 2003 and January 2009. One hundred seventy patients (11%) underwent an exploratory laparotomy (ex lap) in theater and comprised the study cohort. DCL was defined as an abbreviated ex lap resulting in an open abdomen. Patients were stratified by age, Injury Severity Score (ISS), Glasgow Coma Score (GCS), mechanism of injury, and blood product administration. Multivariate regression analyses were used to determine risks factors for intensive care unit length of stay (ICU LOS), hospital length of stay (HLOS), and the need for DCL. Mean age of the cohort was 24 ± 5 years, ISS was 21 ± 11, and 94 per cent sustained penetrating injury. Patients with DCL comprised 50.6 per cent (n = 86) of the study cohort and had significant increases in ICU admission ( P < 0.001), ICU LOS ( P < 0.001), HLOS ( P < 0.05), ventilator days ( P < 0.001), abdominal complications ( P < 0.05), but not mortality ( P = 0.65) compared with patients without DCL. When compared with the non-DCL group, patients undergoing DCL required significantly more blood products (packed red blood cells, fresh-frozen plasma, platelets, and cryoprecipitate; P < 0.001). Multivariate regression analyses revealed blood transfusion and GCS as significant risk factors for DCL ( P < 0.05). Patients undergoing DCL had increased complications and resource use but not mortality compared with patients not undergoing DCL. The need for combat DCL may be different compared with civilian use. Prospective studies to evaluate outcomes of DCL are warranted.

Black tea consumption and risk of stroke in women and men

2013 ◽  
Vol 23 (3) ◽  
pp. 157-160 ◽  
Author(s):  
Susanna C. Larsson ◽  
Jarmo Virtamo ◽  
Alicja Wolk
Keyword(s):  
Black Tea ◽  
Tea Consumption

scholarly journals High Adherence to the Mediterranean Diet Is Associated with a Reduced Risk of Obesity among Adults in Gulf Countries

Nutrients ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 995
Author(s):  
Israa M. Shatwan ◽  
Eiman A. Alhinai ◽  
Balqees Alawadhi ◽  
Shelini Surendran ◽  
Najlaa M. Aljefree ◽  
...  
Keyword(s):  
Mediterranean Diet ◽  
Total Sample ◽  
Cross Sectional Study ◽  
Inverse Association ◽  
Protective Effects ◽  
Hip Circumference ◽  
Cross Sectional ◽  
Gulf Countries ◽  
The Mean ◽  
The Mediterranean

The Mediterranean diet (MedDiet) is considered as a good example of a healthy dietary pattern that has protective effects on obesity. The aim of the present study was to assess the adherence of adults from three Gulf countries (Saudi Arabia, Oman, and Kuwait) to the MedDiet and its association with obesity risk. A cross-sectional study was conducted on 961 men and women (75.7%) aged 20–55 years old. Waist circumference (WC), and hip circumference (HC) were measured waist/hip ratio (WHR) and body mass index (BMI) were calculated. A validated 14-item Questionnaire was used to measure adherence to MedDiet. The mean of the adherence to MedDiet score was 5.9 ± 2.03 for the total sample. An inverse association was observed between the adherence to MedDiet and BMI after adjusting for potential confounders (p = 0.0003 in total participants, and p = 0.001 in women only). A protective effect was seen with a higher adherence to the MedDiet on HC, suggesting that a greater adherence to the MedDiet was associated with a decreased HC (p = 0.04 in total participants, and p = 0.01 in women only). In conclusion, low adherence to the MedDiet among participants from three gulf countries was associated with increased obesity indicators, BMI, and HC.

scholarly journals Positivity to Cocaine and/or Benzoylecgonine in Confirmation Analyses for On-Road Tests in Spain

2021 ◽  
Vol 18 (10) ◽  
pp. 5371
Author(s):  
Francisco Herrera-Gómez ◽  
Eduardo Gutiérrez-Abejón ◽  
Mercedes García-Mingo ◽  
F. Javier Álvarez
Keyword(s):  
Multivariate Regression ◽  
Real Life ◽  
Multivariate Logistic Regression Analysis ◽  
Regression Analyses ◽  
Multivariate Logistic Regression ◽  
Life Data ◽  
Polysubstance Use ◽  
Real Life Data ◽  
Other Substances ◽  
Positive Results

We are using real-life data in order to determine the prevalence of driving with the presence of cocaine and/or benzoylecgonine (BZE), their concentrations, and their use in combination with other drugs. This study assessed data on Spanish drivers with confirmed drug-positive results recorded by the Spanish National Traffic Agency from 2011–2016. Frequencies of positivity for cocaine and/or BZE and concentration of such substances were obtained. Comparisons and univariate and multivariate regression analyses were performed. Drivers who tested positive for cocaine and/or BZE accounted for 48.59% of the total positive results for drugs. In positive cases for both cocaine and BZE, other substances were detected in 81.74%: delta-9-tetrahydrocannabinol (THC) (68.19%), opioids (20.78%) and amphetamine-like substances (16.76%). In the multivariate logistic regression analysis, the frequency of cocaine and/or BZE positive cases decreased with age (OR:0.97) and were less likely among women (OR:0.63). Concentrations (ng/mL) of cocaine (249.30) and BZE (137.90) were higher when both substances were detected together than when detected alone. Positivity to cocaine represented an important proportion among Spanish drivers who tested positive for drugs, and polysubstance use was especially observed in more than 8 out of 10 positive cases for cocaine and/or BZE.

Retirement intentions: what is the role of push factors in predicting retirement intentions?

2012 ◽  
Vol 33 (6) ◽  
pp. 988-1008 ◽  
Author(s):  
JODI OAKMAN ◽  
YVONNE WELLS
Keyword(s):  
Job Satisfaction ◽  
Social Cohesion ◽  
Multivariate Regression ◽  
Regression Analyses ◽  
Length Of Service ◽  
Older Employees ◽  
Work Factors ◽  
Retirement Intentions ◽  
Insight Into

ABSTRACTPopulation ageing will significantly impact labour markets in most Organisation for Economic Cooperation and Development countries and as a result individuals will need to remain in paid employment for longer to fund their retirement years. This study examines the retirement intentions of employees of a large public-sector organisation located in Victoria, Australia that was interested in developing policies to assist with retention of their mature-age workforce. Multivariate regression analyses were used to identify the most important predictors of intention to retire. The dependent variable, Intended timing of retirement, was analysed in two forms, as continuous and dichotomised measures. Age and Length of service were strong independent predictors of Intention to retire soon (within five years). Of the work factors that were analysed (Job satisfaction, Job demands, Job control, and Social cohesion), low Job satisfaction and high Social cohesion scores indicated an increased likelihood of retiring soon. The results provide some insight into the development of organisational interventions that might assist with retaining older employees for longer.

Relation of Fatigue with Alexithymia and Depression in Psychiatric Outpatients

2007 ◽  
Vol 105 (2) ◽  
pp. 539-545
Author(s):  
Thomas N. Wise ◽  
Michael J. Sheridan
Keyword(s):  
Primary Care ◽  
Regression Analysis ◽  
Psychosocial Stress ◽  
Multivariate Regression ◽  
Multivariate Regression Analysis ◽  
Psychiatric Outpatients ◽  
The Mean

The complaint of fatigue is common in community, primary care, and psychiatric settings. Fatigue is often associated with depression and psychosocial stress. This report investigated the role of alexithymia and depression in fatigue as reported in a sample of 151 psychiatric outpatients (75 men and 76 women) who completed all scales. The mean age of the sample was 45.5 yr. ( SD = 12.5), and mean education was 16.2 yr. ( SD = 2.4). Fatigue was inversely correlated with education (–.16) and positively correlated with depression (.44), anxiety (.30), and alexithymia (.35). However, in a multivariate regression analysis, only depression and alexithymia remained significant ( p ≤ .01).

scholarly journals Reduced risk of dyslipidaemia with oolong tea consumption: a population-based study in southern China

2013 ◽  
Vol 111 (8) ◽  
pp. 1421-1429 ◽  
Author(s):  
Deqing Yi ◽  
Xuerui Tan ◽  
Zhiguo Zhao ◽  
Yingmu Cai ◽  
Yiming Li ◽  
...  
Keyword(s):  
Southern China ◽  
Experimental Studies ◽  
Hdl Cholesterol ◽  
Black Tea ◽  
Population Based ◽  
Tea Consumption ◽  
Oolong Tea ◽  
Cholesterol Levels ◽  
Low Hdl ◽  
Biochemical Indices

Experimental studies have suggested that tea consumption could lower the risk of dyslipidaemia. However, epidemiological evidence is limited, especially in southern China, where oolong tea is the most widely consumed beverage. We conducted a population-based case–control study to evaluate the association between consumption of tea, especially oolong tea, and risk of dyslipidaemia in Shantou, southern China, from 2010 to 2011. Information on tea consumption, lifestyle characteristics and food consumption frequency of 1651 patients with newly diagnosed dyslipidaemia and 1390 controls was obtained using a semi-quantitative questionnaire. Anthropometric variables and serum biochemical indices were determined. Drinking more than 600 ml (2 paos) of green, oolong or black tea daily was found to be associated with the lowest odds of dyslipidaemia risk (P< 0·001) when compared with non-consumption, but only oolong tea consumption was found to be associated with low HDL-cholesterol levels. A dose–response relationship between duration of tea consumption and risk of dyslipidaemia (OR 0·10, 95 % CI 0·06, 0·16), as well as that between amount of dried tea leaves brewed and risk of dyslipidaemia (OR 0·34, 95 % CI 0·24, 0·48), was found. Moreover, consumption of oolong tea for the longest duration was found to be associated with 3·22, 11·99 and 6·69 % lower blood total cholesterol, TAG and LDL-cholesterol levels, respectively. In conclusion, the present study indicates that long-term oolong tea consumption may be associated with a lower risk of dyslipidaemia in the population of Shantou in southern China.

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