How Much Do You Know About Caffeine?
Is there a link between heavy caffeine consumption and osteoporosis? Find out when you take this quiz.
1. How does caffeine affect the body?
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Caffeine in low to moderate amounts (one to two cups of coffee) acts as a mild stimulant, boosting heart rate and blood pressure. This results in a feeling of alertness and in increased concentration. Caffeine's effects kick in about 15 minutes after it is consumed and can last up to several hours. At higher doses (more than three cups of coffee a day) and in people sensitive to caffeine, however, it can cause anxiety, insomnia, headaches, stomach irritation, and heartbeat irregularities, according to the American Dietetic Association (ADA) and the American Heart Association (AHA). People who regularly consume caffeine may experience a "withdrawal" 12 to 24 hours afterward, the AHA says. The chief symptom is headache, but other symptoms can include anxiety, fatigue, and drowsiness. These symptoms usually ease within a day or two.
2. Which of these countries consumes the most coffee (per person)?
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The Scandinavian countries, Austria, and the Netherlands have the highest coffee consumption in the world, at more than 22 pounds per person per year. The United States, as well as Italy and Algeria, has among the lowest coffee consumption, at less than 11 pounds per person per year. Coffee consumption in Brazil is more than 13 pounds per person per year. Ireland, the United Kingdom, Turkey, and Kuwait drink the most tea, with Ireland's per person consumption at nearly 7 pounds a year, the United Kingdom at nearly 6 pounds, and Turkey and Kuwait at nearly 5 pounds.
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