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caffeine    音标拼音: [kæf'in]
n. 咖啡因,茶精(兴奋剂)

咖啡因,茶精(兴奋剂)

caffeine
n 1: a bitter alkaloid found in coffee and tea that is
responsible for their stimulating effects [synonym: {caffeine},
{caffein}]

caffein \caf*fe"in\, Caffeine \Caf*fe"ine\, n. [Cf. F.
caf['e]ine. See {Coffee}.] (Chem.)
A white, bitter, crystallizable substance, found in coffee
and tea. It is identical with the alkaloid {theine} from tea
leaves, and with {guaranine} from guarana. It is responsible
for most of the stimulating effect of coffee or tea.
[1913 Webster WordNet 1.5]

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  • Caffeine - Wikipedia
    The most common sources of caffeine for human consumption are the tea leaves of the Camellia sinensis plant and the coffee bean, the seed of the Coffea plant Some people drink beverages containing caffeine to relieve or prevent drowsiness and to improve cognitive performance
  • Caffeine: What It Is, Benefits and Side Effects
    What is caffeine? Caffeine is a type of drug called a stimulant, meaning it increases chemicals in your brain called neurotransmitters
  • Caffeine: How much is too much? - Mayo Clinic
    Up to 400 milligrams (mg) of caffeine a day seems safe for most adults That's about the amount of caffeine in four cups of brewed coffee, 10 cans of cola or two "energy shot" drinks Keep in mind that the caffeine content in drinks varies widely
  • Caffeine - Uses, Side Effects, and More - WebMD
    Caffeine is a natural chemical with stimulant effects It is found in coffee, tea, cola, cocoa, guarana, yerba mate, and over 60 other products Caffeine works by stimulating the central
  • What Is Caffeine, and Is It Good or Bad for Health?
    Caffeine is a natural stimulant consumed throughout the world This article reviews caffeine and its health effects, both good and bad
  • Caffeine | Stimulant, Health Benefits, Addiction | Britannica
    Learn about caffeine's effects on the human body Caffeine has a stimulating effect on the central nervous system, heart, blood vessels, and kidneys It also acts as a mild diuretic Caffeine’s potent stimulatory action makes it a valuable antidote to respiratory depression induced by drug overdose (e g , from morphine or barbiturates)
  • Caffeine: Benefits, risks, and effects - Medical News Today
    Caffeine is a stimulant and the most commonly used drug in the world Benefits can include increased alertness, energy, and concentration However, it can also lead to insomnia and headaches
  • Caffeine - The Nutrition Source
    Although we tend to associate caffeine most often with coffee or tea, the research below focuses mainly on the health effects of caffeine itself Visit our features on coffee, tea, and energy drinks for more health information related to those beverages
  • What is Caffeine? How Much Is Safe? How Does It Work? - UGA Dining Services
    Caffeine is a naturally occurring central nervous system stimulant most commonly found in coffee, tea, and cacao plants When it is consumed, caffeine is quickly absorbed into the bloodstream
  • Spilling the Beans: How Much Caffeine is Too Much? | FDA
    Caffeine can be part of a healthy diet for most people, but too much caffeine may pose a danger to your health Know your limits and the products that may contain caffeine





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