In fact, this is what the old man said before. In the past, cold water was not disinfected or pure water, so there were many bacteria and microorganisms in cold water. At this time, mixing cold water with hot water could not kill bacteria, but turned the water into warm water, which was more suitable for the environment where bacteria lived. At this time, the activity of bacteria increased, which may lead to immediate stomachache.

Try to avoid drinking cold water and cold drinks when drinking water. Eating more fruits is also helpful to improve the gastrointestinal digestive function. If the fruit is too cold in winter, you can try to warm it before eating, or squeeze it into juice to warm it before drinking.