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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
    Caffeine 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)
  • Caffeine: How much is too much? - Mayo Clinic
    Up to 400 milligrams (mg) of caffeine a day appears to be safe for most healthy adults That's roughly the amount of caffeine in four cups of brewed coffee, 10 cans of cola or two "energy shot" drinks Keep in mind that the actual caffeine content in beverages varies widely, especially among energy drinks
  • What Is Caffeine, and Is It Good or Bad for Health?
    Caffeine is a natural stimulant most commonly found in tea, coffee, and cacao plants It works by stimulating the brain and central nervous system, helping you stay alert and prevent the onset of
  • Caffeine: What It Is and What It Does - Cleveland Clinic Health Essentials
    Caffeine is one of the most commonly used stimulants in the world, increasing chemicals in your brain that excite or motivate your central nervous system
  • 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 nervous
  • 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 - The Nutrition Source
    Read on to learn more about sources of caffeine, and a review of the research on this stimulant and health The chemical name for the bitter white powder known as caffeine is 1,3,7 trimethylxanthine Caffeine is absorbed within about 45 minutes after consuming, and peaks in the blood anywhere from 15 minutes to 2 hours [2]
  • Caffeine: Benefits, risks, and effects - Medical News Today
    What does caffeine do to your body? Caffeine is a stimulant and the most commonly used drug in the world Benefits can include increased alertness, energy, and concentration However, it can
  • Caffeine - MedlinePlus
    What is caffeine? Caffeine is a bitter substance that occurs naturally in more than 60 plants including: Coffee beans; Tea leaves; Kola nuts, which are used to flavor soft drink colas; Cacao pods, which are used to make chocolate products; There is also synthetic (man-made) caffeine, which is added to some medicines, foods, and drinks
  • How much caffeine is too much? | MD Anderson Cancer Center
    Most adults can consume about 400 milligrams of caffeine per day without negative effects, the Food and Drug Administration (FDA) writes “A typical dose of caffeine is around 70 to 100 milligrams per drink,” Brown says





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