The characteristic of water is that its effect lasts very shortly. Usually just a few seconds! This is true in summer and winter alike! The most dangerous is cold water, with which we can invite numerous problems. Yes, cold water can be dangerous.
We know that cold water in summer has a negative effect and can cause dangerous and unpleasant colds, but in winter even more! Specifically, due to cold water, the intestines contract in winter, all pores on the skin close, blood vessels narrow, all of which hinder digestion and can even stop it. If you drink cold water and eat fatty food, the fats solidify, become hard to digest, and you feel like you have a stone in your stomach.
When cold water passes through the esophagus into the stomach and intestines, it negatively affects the energy metabolism. The body doesn't spend energy on digesting food, but it has to regulate the water temperature. All of this causes even more fluid consumption, and fats remain undigested.
If mucus forms as a result, something you quickly feel in your mouth, it means that your immune system's energy power has decreased, making you even more susceptible to viral diseases. That's why grandmothers have always cautioned against drinking cold water!
Therefore, in winter (and also in summer!), we should drink warm water because it speeds up body hydration, promotes the production of natural digestive enzymes, accelerates food breakdown, cleanses the blood faster, and speeds up detoxification processes.
And one more thing not to forget: with warm water, the body's need for sugar is reduced!