How Much Caffeine Is Too Much?If you begin your day with a cup of coffee--or two or three--you may have wondered: How much caffeine is too much?
The short answer: 400 milligrams of caffeine per day is safe for most people, which is the equivalent of about four cups of coffee, emergency room physician Robert Glatter, M.D. told USA Today.
Caffeine is a central nervous system stimulant that works by stimulating the brain, according to Drugs.com.
That said, the effects of caffeine do vary from person to person so for some 250 milligrams (2.5 cups of coffee) might be enough to experience caffeine intoxication. Most of us would need 500 milligrams of caffeine to feel such symptoms, which can include heart palpitations, dizziness, elevated blood pressure, insomnia, muscle tremors, frequent urination, nervousness, anxiety, restlessness, diarrhea and stomach upset. Some even have rambling thoughts or confused speech.
But too much caffeine is not likely to result in death. "It would likely take anywhere from 50-100 cups of coffee to result in a lethal dose of caffeine," Glatter told USA Today. "That said, pure powdered caffeine can be lethal if a teaspoon of it is consumed at once. The recommended dose of powdered caffeine in this form is just 1/16th of a teaspoon."
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