IV. Off all the things we eat and drink, water is the most important. Not many people realize this but it is quite true. The human body goes without food for a long time, but two or three days without water usually results in death. Many people don ’ t understand how much water the human body needs to work properly and many people don ’ t drink enough, especially in hot weather. Most people drink when they are thirsty, but we often need more water, especially if we have taking exercise. A man ’ s body is 65 to 75 percent of water. Most people need about five to seven liters of water every day, but we don ’ t need to drink this amount because a lot comes from the food we eat. Or we don ’ t have enough water, we feel thirsty and may become ill. Do you know what the best drink is? Yes, cold water.