According to the research of scientists, the skin of two volunteers drinking warm drinks and cold drinks in hot climate was measured by infrared temperature recorder. The results show that warm drinks can reduce the skin temperature by 1℃ ~ 2℃, while cold drinks can only cool the mouth. At the same time, the two groups have different self-feelings. People who drink warm drinks feel cool and comfortable, and their thirst disappears completely. People who use cold drinks are all sluggish and thirsty again. Warm water molecules close to body temperature can quickly and neatly enter the intestinal wall, so they can quench their thirst. In addition, drinking warm water and sweating can take away some calories in the body, so drinking water is harmless to the body.
On the contrary, cold drinks absorb a lot of heat from the mouth and stomach, and the internal organs suddenly become cold, which will affect the digestive function and cause stomach cramps and diarrhea. So it is better to drink warm water in midsummer.