Green tea, The Beverage Which Ameliorates Symptoms and Treats Depression and Anxiety Disorders

Kyle J. Norton

Green tea may have a potential and positive effect in reducing symptoms of depression and anxiety stress, some scientists suggested.

Depression and anxiety disorders are a psychological illness. Depression disorder is not the same as anxiety disorder however they often share symptoms similar to those of an anxiety.

The causes of depression may be attributed to the numbers of factors such as genetics, changes in hormone levels, certain medical conditions, stress, grief or difficult life circumstances.

In anxiety, risk factors that associated to the early onset of the disease are family history, long-term under stressful situations and excessive alcohol drinking and use of tobacco, particularly in people who had a childhood history of being abused. 

The Mayo Clinic in the classification of anxiety suggested that women are twice as likely as men to experience a generalized anxiety disorder (GAD).

In the comparison of the symptoms of depression and anxiety, one may find several overlaps, including symptoms of sleep problems, trouble concentrating, and fatigue.

Dr. Kathleen Smith, Ph.D. in the classification of the different depression and anxiety wrote, "There are, however, some distinguishing features. People with depression move slowly, and their reactions can seem flattened or dulled. People with anxiety tend to be more keyed up, as they struggle to manage their racing thoughts. Another distinguishing feature is the presence of fear about the future in people with anxiety. Depressed people who do not have anxiety are less likely to be fraught with worry about future events, as they are often resigned to believing that things will continue to be bad. In other words, they may predict the future based on how they feel in the moment".

Green tea, a precious drink processes numbers of health benefit known to almost everyone in Asia and Western world.
The National University Health System, Singapore which launched the study to examine the association between long-term tea consumption and depressive and anxiety symptoms in community-living elderly including 614 elderly aged 60 years and above, who were free of dementia and cognitive impairment suggested base on the Information on tea consumption,
* 59% of the subjects participated in the study had consumed tea for over 15 years.

* Long-term tea consumption was significantly associated with a reduced odds of having depressive and anxiety symptoms, after adjusting for demographics (i.e., age, gender, education, and ethnicity), comorbid conditions (i.e., heart disease, diabetes, stroke, hypertension, and hyperlipidemia) and long-term coffee consumption.

The findings suggested that long-term tea consumption was associated with reduced depressive and anxiety symptoms among community-living elderly. and that may be the reason that tea's bioactive compounds are used in promoting mental health in aging.

Furthermore, in the evaluate the anti-stress effect of green tea with lowered caffeine, low-caffeine green tea, on humans in a single-blind group comparison and participants (n=20) randomly assigned to low-caffeine or placebo tea groups, researchers showed that according to the state-trait anxiety inventory test.
* The subjective stress in participants was significantly lower in the low-caffeine-group than in the placebo-group during pharmacy practice.

* The level of salivary α-amylase activity, a stress marker, increased significantly after daily pharmacy practice in the placebo group but not in the low-caffeine-group.

These results suggested that the ingestion of low-caffeine green tea suppressed the excessive stress response of students.

Moreover, in the review of a systematically searched on PubMed database and selected studies by predefined eligibility criteria, researcher indicated that in out of 21 studies selected, 4 of which were randomized controlled trials, 12 cross-over studies (both assessed with an adapted version of the DELPHI-list), 4 were cross-sectional studies and one was a cohort study

* Green tea intake exerts a significant influence on the psychopathological symptoms (e.g. reduction of anxiety), cognition (e.g. benefits in memory and attention) and brain function (e.g. activation of working memory seen in functional MRI). 

* The effects of green tea is not attributed to a single constituent of the beverage, but the combined influence of both caffeine and l-theanine, whereas separate administration of either substance was found to have a lesser impact.

Taken all together, there is no doubt, standard green tea may be considered a functional food in ameliorating the symptoms of depression and anxiety disorders.

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Author Biography
Kyle J. Norton (Scholar, Master of Nutrition, All right reserved)
Health article writer and researcher; Over 10.000 articles and research papers have been written and published online, including worldwide health, ezine articles, article base, health blogs, self-growth, best before it's news, the karate GB daily, etc.,.
Named TOP 50 MEDICAL ESSAYS FOR ARTISTS & AUTHORS TO READ by Disilgold.com Named 50 of the best health Tweeters Canada - Huffington Post
Nominated for shorty award over last 4 years
Some articles have been used as references in medical research, such as international journal Pharma and Bioscience, ISSN 0975-6299.
Sources
(1) Associations of Long-Term Tea Consumption with Depressive and Anxiety Symptoms in Community-Living Elderly: Findings from the Diet and Healthy Aging Study by Chan SP1, Yong PZ, Sun Y, Mahendran R, Wong JCM, Qiu C, Ng TP, Kua EH, Feng L.(PubMed)
(2) Green tea effects on cognition, mood and human brain function: A systematic review by Mancini E1, Beglinger C2, Drewe J2, Zanchi D1, Lang UE1, Borgwardt S3(PubMed)
(3) Anti-stress Effect of Green Tea with Lowered Caffeine on Humans: A Pilot Study by Unno K1,2, Yamada H3, Iguchi K1, Ishida H4, Iwao Y5, Morita A6, Nakamura Y2.(PubMed)