Whether pure water can be drunk for a long time needs to be decided according to people’s diet, if people have a normal diet, they can drink pure water for a long time, but if their diet is not normal, it is not recommended to drink it for a long time, so as not to cause discomfort. Pure water is made through ion exchange, distillation, reverse osmosis and other processes, the water has removed most of the calcium, iron and other minerals. If people’s daily dietary intake of calcium, iron and other minerals less, long-term drinking of pure water is likely to cause a lack of minerals in the body, ultimately leading to the body’s nutritional deficiencies, which can easily lead to metabolic disorders in the human body, it is not recommended that long-term drinking of pure water. If people in the normal intake of calcium, iron and other minerals in the daily diet, this situation can be long-term drinking pure water, generally will not cause harm to the body. Whether or not to drink pure water, should be nutritionally balanced, scientific diet.