Evidence of a risk during pregnancy is equivocal some authorities recommend that pregnant women limit caffeine to the equivalent of two cups of coffee per day or less. Some people experience sleep disruption or anxiety if they consume caffeine, but others show little disturbance. It may confer a modest protective effect against some diseases, including Parkinson's disease. Caffeine citrate is on the WHO Model List of Essential Medicines. It can treat and prevent the premature infant breathing disorders bronchopulmonary dysplasia of prematurity and apnea of prematurity. Ĭaffeine can have both positive and negative health effects. In 2020, almost 10 million tonnes of coffee beans were consumed globally. Caffeine-containing drinks, such as coffee, tea, and cola, are consumed globally in high volumes. To make these drinks, caffeine is extracted by steeping the plant product in water, a process called infusion. People may drink beverages containing caffeine to relieve or prevent drowsiness and to improve cognitive performance. The best-known source of caffeine is the coffee bean, the seed of the Coffea plant.
It is found in the seeds, fruits, nuts, or leaves of a number of plants native to Africa, East Asia and South America, and helps to protect them against herbivores and from competition by preventing the germination of nearby seeds, as well as encouraging consumption by select animals such as honey bees. Caffeine also stimulates certain portions of the autonomic nervous system.Ĭaffeine is a bitter, white crystalline purine, a methylxanthine alkaloid, and is chemically related to the adenine and guanine bases of deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). The most prominent is that it reversibly blocks the action of adenosine on its receptors and consequently prevents the onset of drowsiness induced by adenosine. There are several known mechanisms of action to explain the effects of caffeine. Unlike many other psychoactive substances, it is legal and unregulated in nearly all parts of the world. It is the world's most widely consumed psychoactive drug.
Caffeine is a central nervous system (CNS) stimulant of the methylxanthine class.
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