Caffeine facts for kids
Caffeine is a drug (or chemical) found in plants. It can be harmful for both humans and animals if a large amount is consumed. If a person ate 10-13 grams of caffeine quickly, between 80-100 cups of coffee, it would kill them.
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Where caffeine is from
Caffeine is the main drug that is in coffee. Coffee comes from a tree. The seeds of the tree are roasted to make coffee.
Caffeine comes from other plants as well. It is in guarana, yerba maté, cacao, and some plants used to make tea. The plants use caffeine as a pesticide. This is a chemical that kills insects if they eat the plant. It is the way the plant protects itself.
What caffeine is
Caffeine is a stimulant drug. A stimulant is a drug that increases body actions like heart rate, blood pressure, and metabolism. It makes a person feel more awake and alert.
Caffeine also is a diuretic. This means it makes a person make more urine (the waste liquid a person makes).
The caffeine chemical is called a xanthine alkaloid. This is a group of chemicals that are stimulants. Some xanthine alkaloids (like theophylline) are used to help asthma.
What caffeine is used for
The biggest use of caffeine is as a stimulant. People drink coffee and other drinks with caffeine to stay awake.
Doctors sometimes use caffeine as a medicine. It is used for headaches (head pain). It is sometimes used to help premature (born very early) babies to breathe.
Caffeine is sometimes given to people after a lumbar puncture. This is a test to see if someone has meningitis.'''
Caffeine also has medicinal properties. It is used in many over the counter medicines, such as Excedrin, Midol and Anacin. When combined with other analgesics, caffeine can help to alleviate headaches and cramps.
However, caffeine can be a very dangerous drug when not used in the right way.
Problems with caffeine
The largest problem with caffeine is addiction. This is when people get bad symptoms when they do not have the drug. When people have withdrawal (feel bad because they do not have the drug), they drink more. This makes them feel better. But if they cannot get more, they are likely to feel some of the symptoms listed below:
Caffeine can also hurt people if they drink a lot at once. If someone takes too much of a drug at once it is called an overdose. Caffeine overdose is a medical diagnosis. It is called:Caffeine-Induced Organic Mental Disorder or Caffeine Intoxication. People with this can have these symptoms:
- Very bad feelings like:
- Muscle movements that cannot be stopped
- Very fast heart rate
- Abnormal heart rhythms (even heart stopping)
- Very high blood pressure
- Vomiting
- Confusion (not knowing who the person is or where he/she is)
How much caffeine is safe
250–300 mg of caffeine a day is a moderate amount. That is as much caffeine that is in three cups of coffee (8oz each cup). More than 750–1000 mg a day is a significant amount, but is very unlikely to kill someone. The Lethal Dose 50 of caffeine is 192 mg per kilogram, in rats. In humans, it is between 150 and 200 mg per kilogram (70-90 per pound.)
Caffeine is in many drinks and foods. This is approximate amounts of caffeine in some food and drink:
- Brewed coffee - 40 to 220 mg in a cup
- Instant coffee - 30 to 120 mg in a cup
- Decaffeinated coffee (with most caffeine taken out) - 3 to 5 mg in a cup
- Tea - 20 to 110 mg in a cup
- Soda drinks with caffeine - 36 to 90 mg in 12 ounces. Some people think that soft drinks which are light in color do not contain caffeine. This is not always true.
- Milk chocolate - 3 to 6 mg in an ounce
- Bittersweet chocolate - 25 mg in an ounce
One ounce – abbreviated oz - is 30ml.
A 'cup' is 8 oz (240ml.)
Different ways to get 200mg of caffeine
| Caffeine equivalents |
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In general, each of the following contains approximately 200 milligrams of caffeine:
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Images for kids
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Urinary metabolites of caffeine in humans at 48 hours post-dose.
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Fibrous crystals of purified caffeine. Dark-field microscopy image, about 7 mm × 11 mm
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Roasted coffee beans
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No-Doz 100 mg caffeine tablets
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Coffeehouse in Palestine, circa 1900
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Pierre Joseph Pelletier
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Caffeine effects on spider webs
See also
In Spanish: Cafeína para niños
