Children Drink More Tea Good?
What's in a tea leaf?
Tea water (tea water) is a very popular drink in the world. Tea is a natural source of caffeine, theophylline and antioxidants, the most important of which is catechin with mainly epigallocatechin-3-gallate.
In tea almost no fat, carbohydrate, or protein, so provides almost no energy and nutrients. 100g of tea leaves contain 4g of caffeine, while 100g of Arabica coffee bean has only 1.4g of caffeine, so tea is a beverage that provides a lot of caffeine.
Caffeine is a central nervous stimulant, because it increases the synthesis and release of neurotransmitter intermediates such as catecholamine, dopamine, noradrenaline, adrenaline, serotonin, acetylcholine ..
People who are sensitive or take high doses may experience muscle tremor, tremor of hands, difficulty sleeping, headache, anxiety, irritability. With the cardiovascular system, caffeine can increase the force of heart muscle contraction, increase or decrease the heart rate, relax peripheral vascular smooth muscle but constrict brain arteries.
Caffeine can cause relaxation of the smooth muscles in the bronchi and alveoli, thus increasing perfusion and increasing air exchange in the lungs, thereby reducing the amount of CO2 deposited.
On the smooth muscle of the digestive system, at first the effect of caffeine is to increase spasms but then to relax, reducing peristalsis at high doses. Gastric and pepsin of the stomach are increased under the effect of caffeine.
The antioxidants in tea help the body prevent the harmful effects of aging, inflammation, the effects of environmental pollution, thus can prevent cancers, cardiovascular diseases and degeneration in nerves, joints, skin .
Green tea has the highest antioxidant effect
Tea leaves can be oxidized (fermented to ferment), heated, dried, or added to grass, flowers, spices, or other fruits before being submerged in water.
There are three main types of tea: green tea, black tea, and oolong tea; all are derived from tea leaves (Camellia sinensis), differ only in the degree of oxidation and processing.
Green tea has the highest antioxidant effect, the ingredient has more catechins than black or oolong tea, but also some of the minerals and vitamins in green tea can help increase the antioxidant capacity.
Vitamine C, vitamin B2, manganese in green tea help prevent cancer, prevent aging, regulate the immune system, increase the body's resistance to disease. Theanin is an amino acid found in green tea that stimulates relaxation, increases concentration and creativity.
Only good if older children drink moderately
The effects of tea on health have been reported after animal and human studies, helping to reduce the risk of cancer, heart disease and high blood pressure.
Some studies also show that drinking tea can prevent cataracts, arthritis, anti-ultraviolet rays, reduce viral and bacterial infections, protect teeth, protect the nervous system, fight atheroma and dissolve body fat.
However, some scientists also warn that using too much tea with a high concentration may not be good due to the high content of caffeine and polyphenols and strong affinity that can cause binding of many types of protein, fiber .
Some suggest that the caffeine in tea can reduce the amount of calcium absorbed in the intestine and reduce the reabsorption of calcium in the renal tubules causing osteoporosis, the tannins in tea reduce the absorption of iron so it is easy to cause anemia.
Therefore, drinking tea as much as the risk of iron deficiency, leading to anemia. Tea also reduces the absorption of zinc, which is not beneficial for children, especially children who are malnourished due to the high demand for zinc.
Thus, those who are anemic while taking iron supplements, zinc supplements, children and pregnant women who need high iron and zinc requirements should not drink tea.
Tea has a thermogenic effect by increasing the body's fat breakdown, so children with fever should not drink tea, and tea water also reduces the effect of fever-reducing medicines.
People with trouble sleeping, especially young children who have a high demand for sleep, should not use tea, especially in the evening because tea causes nervous excitement to make it harder to sleep.
Tea also increases gastric secretion, so it is not suitable for children whose inherent protective layer of mucus is fragile, prone to ulcers, similar to those with a history of peptic ulcer. Tea is also a causative agent in children, pregnant women, the elderly, and people with weak intestinal motility.
As such, tea works well if used in moderate doses in adults and some older children.
In young children, it is important to consider the beneficial effects of antioxidant and some adverse health effects. Young children have high nutritional needs, need protein, iron, zinc, calcium ... but tea reduces the absorption of these substances.
The digestive system of young children is also incomplete, prone to confusion when drinking caffeine; Children also need deep sleep to develop, so using stimulants like tea, coffee is not beneficial.
Not to mention, tea for children or with milk and pearls, fruit syrup contains lots of sugar, or for a lot of sugar to cover the acrid taste, so it is easy to cause infection if not processed and protected.. . Dịch vụ: Thiết kế website, quảng cáo google, đăng ký website bộ công thương uy tín
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