I found it on China Coffee Trade Online, which should be more professional. Caffeine contained in coffee will excite sympathetic nerves after entering the body, thus eliminating drowsiness, improving blood circulation and making the body feel warmer without fatigue, so it has a "refreshing" effect.

But the stimulation and excitement of sympathetic nerve has a negative effect on appetite, that is, appetite will decrease, so drinking coffee before meals will make you unwilling to eat. In addition, because the stomach is stimulated, the secretion of gastric juice increases, which stimulates fasting, which is not good for patients with gastric ulcer. But drinking after meals will help digestion, because the secretion of gastric juice will increase. So it's absolutely no problem to drink after meals.

Of course, the so-called "too much is too late", no matter how good things are, we must "enough is enough." In principle, two or three cups of coffee a day are appropriate. Most people will feel sick if they drink four or five cups, so be careful. There is still a lot of knowledge and some skills worth seeing on the Chinese coffee trading network.