Just in time for Halloween, the FDA has come out with a warning that eating too much black licorice could lead to heart problems in adults.. Here are five surprising hazards to keep an eye out for this Halloween. "Heart attack" licorice: Consuming too much black licorice may cause abnormal heartbeats, or arrhythmias, particularly in order adults, according to the Food and Drug Administration. Black licorice contains the compound glycyrrhizin, which can cause the body's potassium levels to fall. In some people, this can lead to, besides arrhythmias, edema (swelling), lethargy or congestive heart failure, the FDA says. Several studies have linked black licorice to health problems in people over 40. The agency has the following advice for licorice lovers: Don't eat lots of black licorice all at once; and if you've been binging on the stuff and you experience irregular heartbeats or muscle weakness, contact your doctor. "Halloween diarrhea": Candy flavored with the sugar substitute sorbitol can cause diarrhea and other gastrointestinal problems. Sorbitol has fewer calories than sugar, and so it is often used in "dietetic" candies, according to the Center for Science in the Public Interest. [Halloween Health: The Best and Worst Trick-or-Treat Candy] When adults consume 10 to 50 grams of sorbitol, they may experience a range of gastrointestinal symptoms, from mild gas and bloating to cramps and serve diarrhea, the CSPI says. Children may be affected by smaller amounts. Flying eggs: Eggs thrown around Halloween time can cause severe eye injuries, according to a landmark study of the issue, published in the ... More »