Drink a glass of water first thing in the morning, hot water in winter and cold water in summer. Chinese medicine says, "My stomach is weak in the morning." Therefore, I drink cold water to stimulate my stomach. This is health first. "To put it bluntly, when people just wake up from sleep, the stomach is in a weak state. At this time, they should not eat, only drink water, and use clear water to make the hypothalamus hungry.