Earlier, some Chinese medicine experts said that drinking cold boiled water in the morning would seriously damage health and even induce many diseases. This view scares many people, because they have always done so! How harmful is a cup of cold boiled water in the morning?

Indeed, as experts say, the early morning is the time when the human body's yang is born, which is also one of the reasons why many diseases, such as cardiovascular and cerebrovascular diseases, and even many people who do morning exercises suddenly die in morning exercises because they get up too early.

Our body has two kinds of nerves, called "sympathetic nerve" and "parasympathetic nerve", which cooperate to control internal organs and blood vessels. When sympathetic nerve is excited, the body is active; When the parasympathetic nerve is excited, the body is in a state of rest and relaxation. Generally, it is innervated by sympathetic nerve during the day and parasympathetic nerve at night.