Black coffee can be consumed moderately after dinner, but pay attention to the amount, otherwise it may cause sympathetic excitation, resulting in insomnia, palpitations and so on.
Black coffee is rich in alkaloids, of which caffeine (i.e. caffeine) is the most abundant, and caffeine has the effect of central nervous system excitation. Caffeine has the effect of central nervous system excitation, which is mainly manifested in increased heart rate, faster breathing, and reduced brain fatigue.
In addition, the sympathetic excitatory effect of caffeine can promote the secretion of gastric acid, promote gastrointestinal power, and have a certain degree of help in digestion.
But drink black coffee after dinner must pay attention to a small amount and do not drink before going to bed, otherwise it may be difficult to fall asleep, affecting the quality of sleep, leading to biological clock disorders.