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Effects of Coffee

by June Hathaway
  • Overview

    Effects of Coffee
    Effects of Coffee
    If you need a steaming mug of hot coffee to clear the morning cobwebs, you're not alone. Coffee's active ingredient, caffeine, is the most popular mind-altering drug in America, according to the Mayo Clinic. Caffeine stimulates your central nervous system by blocking the effects of adenosine, the brain chemical that makes you feel tired.
  • Mental Alertness

    Coffee's best-known effect is the mental pick-me-up it provides. Alertness and concentration improve when the central nervous system is stimulated.
    Physical Effects
  • Physical Effects

    Every time you drink a cup of coffee, your pituitary gland releases a burst of adrenaline, your liver puts out a little extra blood sugar, your heart beats faster, and your lungs deliver more oxygen.
  • Health Benefits

    Coffee protects against many diseases. Researchers around the world have found that coffee drinkers are less likely to develop Alzheimer's disease, type 2 diabetes, heart disease, and many kinds of cancer.
  • Addiction

    Caffeine may be addictive. A 2003 study at Johns Hopkins Medical center found that--when heavy coffee drinkers were deprived of their fix--they suffered withdrawal symptoms including headaches, fatigue and depression.
  • Negative Effects

    According to the Mayo Clinic, people who consume 500 to 600 milligrams of caffeine---the equivalent of four 12-ounce mugs---may suffer from anxiety, insomnia, nausea, and irregular heartbeat.

    References & Resources