It is known to all that plays an important role in maintaining necessary physical activities for the human body. Water can at least extend our life by ten years. When people get sick, the doctors always advise them to drink much water. This is because water can remove the wastes from the human body. Nowadays, various toxic substances contained in foods can be accumulated inside the human body to cause various diseases. For example, the food additives can leave in the human intestines to pollute the internal organs and cause diseases like diarrhea. It is important to remove the pollutants from the body so as to prevent various diseases. The best way to remove the pollutants is to drink water. 

At the same time, people should learn to drink water in a healthy way. It is necessary for people to drink a cup of water in the morning and in the evening respectively. During the day, 1500 to 2000 milliliters of water should be drunk. The inadequate intake of water can cause many diseases including obesity and apoplexia. People should also drink moderate water before they have dinner. According to the medical research, there are six advantages for people to drink water before they have dinner. First, the brain vitality can be stimulated to remember new information for a long time. Second, the human immunity can be enhanced and the invasion of bacteria can be resisted. Third, water can stimulate the nerves to produce unique substances to resist depression. Fourth, insomnia can be improved, as water plays an important role in adjusting the sleep. Fifth, various cancers can be prevented by adequate water. Sixth, the heart disease and vessel blocking in the brain can be effectively prevented.

The medical experts make a reasonable list of drinking water for people to take into consideration. At 6:30 a.m., people can drink 250 milliliters of water to remove the toxins from the kidney and liver. At 8:30 a.m., people can also drink 250 milliliters of water before they begin to work to alleviate the nervous emotion. At 11:00 a.m., people can drink another cup of water to supplement the lost water. At 00:50 p.m., people can drink a cup of water to improve the digestion. At 3:00 p.m., people can drink tea or coffee containing caffeine to refresh themselves. At 5:30 p.m., people can drink a cup of water before they get off work. At 10:00 p.m., people can drink water in a moderate amount before they go to bed.