Green tea is found to have a psychological effect on patients with depression, a renowned institute study suggested.
Depression is a normal response as part of our daily lives such as the loss of s job, the death of a loved one, or an illness, affecting the way you eat, sleep, and the way you feel about yourself. Over 30 million Americans suffer from depression and the amount is increasing at an alarming rate.
Green tea, a precious drink processes the number of health benefits known to almost everyone in Asia and the Western world. However, as yin in nature herbal medicine or food, long-term injection of large amounts may obstruct the balance of yin-yang, inducing "yin excessive syndrome" or "yang vacuity syndrome" including weakened immunity and painful cases of GERD,... according to traditional Chinese medicine's Yin-Yang theory.
In a cross-sectional study of the consumption of green tea and coffee ascertained with a validated dietary questionnaire and the amount of caffeine intake estimated from these beverages, green tea consumption is associated with reduced symptoms of depression, depending on the amount of intake.
In comparison to the amount intake of participants, the study also found that participants who consumed ≥4 cups of green tea/d had a 51% significantly lower prevalence odds of having depressive symptoms than those who consumed less than 1 cup/d.
Dr. Pham NM, the lead author in the study said, "Higher consumption of green tea, coffee, and caffeine may confer protection against depression".
In vivo, green tea(GT) and GABA green tea (GGT) also expressed a protective activity against post-stroke depression (PSD), a common consequence of stroke, according to a joint study led by Pavia University.
In a mouse model of post-stroke depression, GGT and GT enhance the activity in the modulation of depressive symptoms through decreased oxidative stress, and increased antioxidant endogenous defenses, including polyphenol, theanine, glutamine, etc......
Furthermore, in the review of Embase, PubMed, and Chinese National Knowledge Infrastructure databases from their inception through August 2014, tea consumption of more than 3 cups a day showed a significant decrease in the risk of depression of 37% (RR = 0.63, 95% CI: 0.55-0.71), in compared to individuals with lower tea consumption and those with higher tea consumption.
Taken together, there is no doubt, that green tea may be used as a functional food in reduced symptoms and risk of depression if consumed daily. However, oral administration of large amounts daily should be taken with care, particularly for people with yin constituents.
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Sources
(1) Green tea and coffee consumption is inversely associated with depressive symptoms in a Japanese working population by Pham NM1, Nanri A1, Kurotani K1, Kuwahara K1, Kume A1, Sato M2, Hayabuchi H3, Mizoue T1. (PubMed)
(2) Antidepressive-like effects and antioxidant activity of green tea and GABA green tea in a mouse model of post-stroke depression by Di Lorenzo A1, Nabavi SF2, Sureda A3, Moghaddam AH4, Khanjani S4, Arcidiaco P5, Nabavi SM2, Daglia M1. (PubMed)
(3) Effect of green tea on reward learning in healthy individuals: a randomized, double-blind, placebo-controlled pilot study by Zhang Q1, Yang H, Wang J, Li A, Zhang W, Cui X, Wang K.(PubMed)
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