Just in time for Halloween, there's a new warning from the U.S. Food and Drug Administration (FDA) about the dangers of black licorice. If you’re 40 or older, eating two ounces of black licorice a day for at least two weeks could cause an irregular heart rhythm or arrhythmia.
According to foodconsumer.org:
FDA experts say black licorice contains the compound glycyrrhizin, which is the sweetening compound derived from licorice root. Glycyrrhizin can cause potassium levels in the body to fall. When that happens, some people experience abnormal heart rhythms, as well as high blood pressure, edema (swelling), lethargy, and congestive heart failure.
Better stick to Red Vines.