Anyone can get diarrhea. In fact, the typical American adult experiences diarrhea about four times a year. Most cases of diarrhea last a day or two and need no treatment. Find out more about this common digestive problem by taking this quiz.

You hear a lot about fiber and why you need it. But what is it? Learn more about this important part of your diet by taking this quiz.

Find out how much you know about the newest dietary guidelines and how they differ from the old food pyramid.

When you're thirsty for a drink of water, you probably turn on the tap, or open a container of bottled water. You may take for granted the quality of the water you drink. but water safety can vary from place to place. Find out more about drinking water by taking this quiz, based on information from the U.S. Environmental Protection Agency.

Drug abuse and addiction can break apart families, ruin personal relationships, and make it difficult to keep a job.

As a source of foodborne illness, E. coli bacteria can be deadly. But aren't E. coli also regular residents of our intestines? When do E. coli become the "bad guys"? To learn more about this common bacterium, take the following quiz.

Infections of the middle ear, called otitis media, seem to be a common badge of childhood. Seventy-five percent of children experience at least one episode of otitis media by their birthday. How much do you know about this illness?

Ear, nose, and throat problems affect both children and adults. Knowing how to prevent them and how to treat them if they occur can help you stay healthy. See what you know about the ears, nose, and throat by taking this true-false quiz.

Don't sit too close to the TV. Don't watch TV without a light on in the room. Don't use over-the-counter eyedrops. Are these statements true? Find out by taking the following quiz.

Fever seems to serve a helpful function in the body. See how much you know about fever by taking this quiz.