The concept of drinking a glass of water on an empty stomach in the morning is already well understood, however, what kind of water should be drunk, how much to drink and what are the contraindications are not clear to everyone. Some people do not like to drink plain water, want to drink some other kinds of water in the morning, is it possible to do so? The role of the first glass of water in the morning Temperature: and body temperature, too hot too cold are hurt the stomach. We often see on TV many westerners get up early in the morning and pour water from the refrigerator to drink, but this can easily bring some health risks. Drinking cold water early in the morning will make the gastrointestinal mucosa suddenly cold, so that the original open capillaries contracted, causing gastrointestinal discomfort and even diarrhea. Too hot water is also not recommended, because the high temperature of the water into the esophagus, easy to destroy the esophageal mucosa, and even increase the risk of esophageal cancer. Therefore, the temperature of the first glass of water in the morning should not be too hot or too cold, and the body temperature can be roughly equivalent. The reason why light salt water is used as the first cup of water in the morning is because it can relieve constipation, the treatment of constipation can not be solved by drinking water alone, but through the reasonable adjustment of diet. Modern people’s sodium intake is already too much, in the body does not lack of salt and then drink light salt water, will increase the intake of salt, but make people feel dry mouth. He Li, a researcher at the Institute of Nutrition and Health of the Chinese Center for Disease Control and Prevention, believes that light brine is the least recommended. People with high blood pressure, cardiovascular disease, and abnormal kidney function should not use light salt water as the first cup of water after waking up, because the morning is the first peak of the body’s blood pressure rise, drinking salt water will make blood pressure higher. Honey water is suitable for constipated people Some people believe that a glass of honey water early in the morning is good for relieving constipation, but drinking on an empty stomach is not suitable. Honey contains a lot of fructose and glucose, which can raise blood sugar and affect breakfast intake. In addition, the fructose in honey has to be metabolized into glucose before it can be absorbed and used by the body, so it loses the role of the first glass of water in the morning to cleanse the body of waste, and the nutrients of honey cannot be effectively absorbed. Therefore, do not drink honey water on an empty stomach after waking up, you can drink a glass of warm plain water first, and then drink honey water after ten minutes, or you can eat honey as breakfast, smeared on bread together.