Caffeine is a plant alkaloid, which can be found in many plants. In general, caffeine is alkaline because it has bases and carboxyl groups.

Among animal foods, except milk, most of them are acidic foods; Among plant foods, except grains, miscellaneous grains and beans, most of them are alkaline foods; Salt, oil, sugar, coffee and tea are all neutral foods.

Extended data:

Coffee beans contain about 100 different substances, including caffeine, tannic acid, oil and nitrogen compounds, etc. Every 100 gram of instant coffee contains 44~ 100 mg of caffeine; Every100g of brewed coffee contains 64 ~124mg of caffeine.

Coffee is a stimulant, which has many effects on human body. It can induce diuresis, stimulate the central nervous system and respiratory system, dilate blood vessels, accelerate the heartbeat, enhance the strength of striated muscles and relieve brain and muscle fatigue.

Caffeine is a xanthine alkaloid compound (plant alkaloid) and a central nervous system stimulant, which can temporarily drive away drowsiness and restore energy, and is used to treat neurasthenia and coma resuscitation in clinic. Coffee, tea, soft drinks and energy drinks with caffeine are very popular, so caffeine is also the most widely used psychotropic drug in the world.

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