Green tea is not fermented, so the leaves retain their green color. The leaves are arranged on bamboo surfaces and exposed to the sun for a few hours. Then they are steamed (100 ° C) for at least 30 seconds, in order to inactivate some enzymes.
Various drying phases follow (usually 4, lasting about 20-40 minutes each) which evaporate a large percentage of the water contained in the leaves. The drying makes the leaves soft and is interspersed with phases of folding or rolling (at this point they can be folded into particular shapes, as in the Gunpowder variety).
When the leaves are well dried they are ready to be refined (dust and debris are eliminated) and eventually toasted (as for Hojicha), then they are sent for packaging. Green tea has been used in traditional medicine in India, China, Japan and Thailand, with various goals: from controlling bleeding, body temperature, blood sugar, to improving wound healing and digestion.
In the Kissa Yojoki (Book of Tea), the Zen priest Eisai described in 1191 the beneficial effects of green tea on the five vital organs, particularly the heart. The book lists the medicinal qualities of tea: it relieves the effects of alcohol, acts as a stimulant, treats pustulosis, dulls thirst, relieves indigestion, cures beriberi, prevents fatigue, improves urinary and brain function.
The study: Green Tea, A Medicinal Food with Promising Neurological Benefits, published on the Current neuropharmacology, tries to explain its neurological benefits. We can read: "Neurological disorders and their sequelae, as of the widespread and critical humans' complications, affect the body's nervous systems, organ functions, and behaviors.
According to WHO, neurological disorders are currently predicted to affect more than one billion people globally . It is well-established that complementary medicine is one of the high accepted interventions that could have been considered for the management of neurological ailments.
The current review aimed to compile all the crucial data reporting the investigation on the conspicuous intervention of green tea (made of Camellia sinensis) and related lead compounds (especially l-theanine, epigallocatechin- 3-gallate, epicatechin-3-gallate, epicatechin, and epigallocatechin) for their neurological activities, mechanisms of action, and clinical properties.
According to the documents, green tea exhibits antidepressant, anti-neurodegenerative (eg, anti-Parkinson and anti-Alzheimer), as well as neuroprotective and ffects.Chief among them, for offering novel work, it is worth focusing on several related assessments with great attention to more extensive standardized clinical trials, and subsequently more in-depth pharmacokinetic studies to safely introduce this beneficial medicinal food as a neuro-effective agent."