How much do you know about caffeine?

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Can you live without your morning coffee or afternoon soda? See how savvy you are about your daily buzz.

Question 1 of 12

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There's no caffeine in decaffeinated coffee.

Even decaf coffee comes with a little bit of caffeine. Researchers recently looked at random decaf coffee samples and found they had between 8.6 and 13.9 mg of caffeine. That's about one-10th the caffeine in a regular cup of coffee.

Question 2 of 12

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illustration of drinks with caffeine
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Which has the most caffeine?

Believe it or not, snacking on 1 cup of semisweet chips can give you twice the caffeine as a restaurant espresso. A root beer offers the least amount of caffeine buzz, followed by green tea.

Question 3 of 12

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Caffeine is dehydrating.

Drinking beverages with caffeine may have a mild diuretic effect — meaning you may have to go to the bathroom more. But caffeinated beverages don't seem to up your chances of becoming dehydrated. Still, to stay safe, it's always a good idea to drink water.

Question 4 of 12

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Darker roast has more caffeine.

It's a common coffee myth that rich, strong flavor must be due to an extra jolt of caffeine. But roasting burns off some of that caffeine, NPR reports, so choose a dark French or Italian roast if you want a cup with less of a buzz.

Question 5 of 12

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coffee beans
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Which beans give you more buzz?

Of the two most common coffee bean varieties, Arabica beans have about half the caffeine of robusta beans. Robusta beans are usually in instant coffee, espresso and coffee blends. Arabic beans are typically more expensive and make for more flavorful, less bitter coffee.

Question 6 of 12

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​What percentage of American adults consume caffeine every day?

We sure love our caffeine. Four out of five Americans get a buzz from coffee, soda or energy drinks every day, consuming an average of 300 mg daily, reports the FDA. That's the equivalent of three 5-ounce cups of coffee or six sodas.

Question 7 of 12

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According to the FDA, caffeine is:

Caffeine is added to some drinks and has recently been added to foods — including candy, nuts and other snack foods for people wanting a quick buzz — but it's also added to some prescription and over-the-counter drugs. It's used to combat drowsiness and help some pain relievers work better.

Question 8 of 12

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How long does it take for caffeine to reach its peak level in your blood?

Caffeine works fast. It takes an hour or less for that morning cup of coffee to wake you up. The effects of caffeine can last from eight to 14 hours, which is why you might have trouble falling asleep even if the last soda or coffee you had was at lunchtime.

Question 9 of 12

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man hugging coffee cup
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Caffeine is addictive.

It may seem like it if you miss your morning coffee, but there's no scientific proof that you can become addicted to caffeine. If you consume a lot of caffeine and then stop, you may experience mild withdrawal-type symptoms including headache and irritability.

Question 10 of 12

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Moderate caffeine consumption may reduce your risk of:

Some studies have shown that a moderate amount of caffeine can lower your chance of several conditions including diabetes, gallstones, Parkinson's disease and liver disease, reports WebMD. (But that doesn't mean you should use caffeine to try to decrease your disease risks.)

Question 11 of 12

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woman with headache
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Caffeine can:

It's possible for caffeine to both cause and cure a headache. Some people can get a headache from caffeine withdrawal or from too much medication, including those that have caffeine. But caffeine can be a helpful ingredient in many pain relievers. Some people find relief from headaches — particularly migraines — with caffeine. It helps your body absorb the active ingredients in pain relievers more quickly.

Question 12 of 12

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Who does caffeine affect more strongly?

Caffeine has a greater impact on men than women, according to a recent study. Another study, however, found that drinking coffee with caffeine helps a woman's performance in stressful situations, but does the opposite for men.