Drinking tea to relieve tiredness after a meal is related to caffeine, the main ingredient in tea. Tiredness after meals is due to after eating a meal, the blood around the body is concentrated in the distribution of the digestive tract, especially in the gastrointestinal tract, to help digestion and absorption. At this time relative to the emergence of insufficient blood flow back to the heart, insufficient blood supply to the brain phenomenon, it will cause generalized fatigue, the phenomenon of drowsiness after meals. And the main components of tea have caffeine, and some other nutrients, such as a variety of vitamins, trace elements or minerals. Caffeine is a central nervous system stimulant, can stimulate the cerebral cortex, so as to relieve fatigue. Caffeine can be combined with the brain’s potent hypnotic substance adenosine receptor A2, which produces the opposite of adenosine to promote arousal, that is, refreshing the role of the brain, can temporarily drive away sleepiness, so that people think active, and is conducive to the expansion of cardiovascular and cerebral blood vessels, so that the speed of blood flow is accelerated, to improve the blood supply of cardiovascular and cerebral blood vessels. Daily moderate drinking tea, but should not drink strong tea, should not drink tea immediately after meals.