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caffein    
n. 咖啡碱;茶精

咖啡硷;茶精

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


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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 content for coffee, tea, soda and more - Mayo Clinic
    Experts say up to 400 milligrams (mg) of caffeine a day may be safe for most adults But if you get headaches or are restless or nervous after having caffeine, you may want to rethink how much caffeine is right for you
  • 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
  • Caffeine: What It Is and What It Does - Cleveland Clinic Health Essentials
    Can’t get through the day without your morning cup of joe? Caffeine is one of the most commonly used stimulants in the world But what is it, and what are its possible benefits and risks?
  • 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
  • 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
  • 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]
  • The Effects of Caffeine on Your Body - Healthline
    Caffeine can kick start your senses within 15 minutes See exactly what caffeine does to your body with this interactive graphic
  • 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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