How Caffeine Affects You

Caffeine is a stimulant that is found naturally in leaves, seeds and fruit. Caffeine is absorbed by the body and carried through the bloodstream. Excessive caffeine intake can lead to increased heart rate, frequent urination, nausea and vomiting, restlessness, anxiety, depression, tremors and difficulty sleeping. Moderate consumption is considered to be approximately 300 milligrams or about 3 cups of coffee per day and this amount should not cause any health problems. An intake of 600 milligrams or more a day is likely to have health risks.

Some approximate caffeine amounts in popular food/drinks:

  • 8oz cup of brewed coffee (85mg)
  • 8oz cup of brewed tea (47mg)
  • 8oz of chocolate milk (5mg)
  • 12oz can of cola (37mg)
  • 12oz can of cola with higher caffeine (100 mg)
  • 1.55oz milk chocolate bar (9mg)
  • 1.69oz M&M’s (5mg)
  • 1oz semisweet dark chocolate (20mg)


Internet FAQ Archive: Caffeine

National Library of Medicine: Caffeine


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