Green Tea: Benefits, Uses, Effects?
Green tea has slimming properties and therapeutic? Green tea is well known for its useful not only for weight loss but, mainly due to the young leaves roasted with steam flow in order to inactivate the enzymes oxidizing retaining the dark green color.
The leaves of black tea (same species) before roasting at a temperature of 120 ° C, are dried in the sun, undergoing the action of enzymes able to transform some of the components in substances responsible for the aroma and to darkening of the leaves.
Green tea composition and therapeutic properties:
The leaves contain the following chemical principles.
Polyphenolic compounds (30%) mainly catechins or flavonols (epigallocatechin-3-O-gallate (EGCG), epicatechin, epicatechin-3-O-gallate (ECG), catechin, epigalloca-TeChina), flavonoids, tannins, ac.clorogenico.
Purine bases: caffeine or caffeine content (1-5%) and small amounts of xanthine alkaloids (theophylline, theobromine, etc..).
Vitamins and minerals (vitamin C, vitamin B complex, calcium, iron, fluorine).
Green tea will recognize the following properties:
Antioxidants, protective of the cardiovascular, cholesterol lowering drugs.
Stimulating basal metabolism, lipolytic, CNS tonic, diuretic.
Maintaining glucose homeostasis
Antioxidant, hypolipidaemic, anti-inflammatory green tea:
The free radicals and ROS (reactive oxygen species) that are formed in the organism as a result of oxidative stress induced damage to cells by accelerating the aging process and the development of chronic degenerative diseases.
The polyphenolic compounds inhibit the formation of ROS by promoting their capture (radical scavengers). In fact, the substances become less aggressive, thus saving physiological antioxidants (SOD, glutathione peroxidase, ubiquinone, catalase, carotenoids, vit.C and E).
In vitro and in vivo indicate that between polyphenols, EGCG and ECG are the most active in the development of systems of detoxification in reducing oxidative damage and preventing the formation of atherogenic potential agents responsible for part of cardiovascular disease .
The polyphenols in green tea appear in rats subjected to hypercholesterolemic diet with antioxidant properties increase in serum lipoprotein (HDL "good" cholesterol), thus assuming a possible role antiaterosclerotico.
Always free rats assumptions of solubilized extracts of green tea for 5 weeks favoring a reduction in the production of metabolites related to lipid peroxidation, particularly malondialdehyde suggesting protective effects against lipid peroxidation in the liver (action antiepatotossica), in the blood and central nervous tissue.
Regular ingestion of green tea in humans (1000 ml / day) did not show a significant reduction in vivo and in vitro lipid peroxidation was observed antioxidant activity on human plasma (catechins).
The antioxidant activity, the reduction of free radicals, the effect of lipid-lowering, anti-platelet and blood pressure lowering, justify the indication of green tea as an aid in the prevention of cardiovascular diseases.
The fact that the Japanese and the Chinese, with the constant consumption of green tea boasted a lower incidence of cardiovascular disease and cancer with a longer life expectancy, has suggested a possible chemopreventive effect of polyphenols.
Recent clinical studies have in fact confirmed the dose-dependent inhibitory action of catechins in relation to cell proliferation. The major protective effects of EGCG are due to confirm the higher potential preventive recognized green tea 5 times richer than the black tea catechin in this.
EGCG protects normal cells against genotoxic agents and induces apoptosis ie programmed cell death in cancer cells.
Activity of green tea for weight loss, thermogenesis, body weight, blood sugar level:
In vitro, the ethanolic extract of green tea standardized to 25% EGCG inhibits gastric and pancreatic lipases stimulating thermogenesis.
In vivo, the same extract after three months in moderately obese patients reduces body weight by 4.6% and waist circumference of 4.48%, thus confirming its efficacy in the treatment of obesity.
Vitamin C reduces in adipocytes in vitro the concentration of triglycerides for inhibition of glycerophosphate dehydrogenase.
The lipolytic activity of green tea could then in part be attributed to its content of vitamin C can counteract the accumulation of triglycerides.
Recent studies suggest that green tea extract stimulates thermogenesis in brown adipose tissue for interaction between catechins and caffeine with norepinephrine.
The catechins inhibit catechol-O-methyl transferase and caffeine inhibits phosphodiesterase, both enzymes can not then turn off the increasing norepinephrine adrenergic effects.
Injections of EGCG in rats showed a reduction in eating, a decrease in body weight, lowering blood glucose, cholesterol, triglycerides.
EGCG increases insulin activity in vitro while the ECG maintains glucose homeostasis by modulating food intake of glucose. Maintaining glycemic homeostasis, the hypolipidaemic action, increased thermogenesis in brown adipose tissue and the oxidative metabolism by the catechins and methylxanthines, justify the use of green tea in the cases of overweight and obesity, to facilitate the reduction of body weight.
What is green tea?
Overweight, obesity, salt and water retention.
Fostering a protective antioxidant.
Diuretic activity of green tea and tonic CNS
Methylxanthines act favoring the renal elimination of water and electrolytes.
Theophylline, increasing the glomerular filtration rate and renal blood flow has a diuretic shorter but more effective than that exerted by caffeine.
For these properties, the drug is recommended in situations swollen with salt and water retention.
The methylxanthines stimulate the central nervous system by strengthening intellectual activity and an increase in the level of vigilance and mental tone.
The extracts may then be indicated in situations of functional asthenia, psychological and physical.