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 this quiz.

The more active you are, the more calories you burn. Running or jogging, for instance, burns more calories than bowling.

Most adults who drink alcohol are moderate drinkers and are at low risk for alcohol dependence. If you're concerned about drinking use this tool to find out if you have a problem.

Migraine headaches are intense, recurrent headaches that may occur at any age but usually begin between the ages of 10 and 30 years. The precise cause is unknown, but it is hereditary in up to 80 percent of cases. This video gives additional details about migraines, including their symptoms and effective treatments.

Plastic surgery is becoming more popular, with the most common procedure now breast augmentation, or enlargement. Contrary to what you may think, women with breast implants aren't immune to breast cancer.