As it turns out, you really can overdose on candy—or, more precisely, black licorice. Days before the biggest candy eating holiday of the year, the Food and Drug Administration (FDA) encourages moderation if you enjoy snacking on the old fashioned favorite. So, if you’re getting your stash ready for Halloween, here’s some advice from FDA: If you’re 40 or older, eating 2 ounces of black licorice a day for at least two weeks could land you in the hospital with an irregular heart rhythm or arrhythmia. FDA experts say black licorice contains the compound glycyrrhizin, which is the sweetening compound...