Tea has been one of the daily necessities in China since time immemorial. Countless numbers of people like to have their aftermeal cup of tea.
In summer or warm climate, tea seems to dispel the heat and bring on instant cool together with a feeling of relaxation. For this reason, tea-houses abound in towns and market villages in South China and provide elderly retirees with the locales to meet and chat over a cup of tea.
Medically, the tea leaf contains a number of chemicals, of which 20-30% is tannic acid, known for its anti-inflammatory and germicidal properties. It also contains an alkaloid (5%, mainly caffeine), a stimulant for the nerve centre and the process of metabolism. Tea with the aromatics in it may help resolve meat and fat and thus promote digestion. It is, therefore, of special importance to people who live mainly on meat, like many of the ethnic minorities in China. A popular proverb among them says, "Rather go without salt for three days than without tea for a single day."
Tea is also rich in various vitamins and, for smokers, it helps to discharge nicotine out of the system. After wining, strong tea may prove to be a sobering pick-me-up.
The above, however, does not go to say that the stronger the tea, the more advantages it will yield. Too much tannic acid will affect the secretion of the gastric juice, irritate the membrane of the stomach and cause indigestion or constipation. Strong tea taken just before bedtime will give rise to occasional insomnia. Constant drinking of over-strong tea may induce heart and blood-pressure disorders in some people, reduce the milk of a breast-feeding mother, and put a brown colour on the teeth of young people. But it is not difficult to ward off these undesirable effects: just don't make your tea too strong.