As costume-clad kids get ready for a night of trick-or-treating, the U.S. Food and Drug Administration has a warning for candy-loving grown-ups: Too much black licorice can cause heart problems.
The old-fashioned favorite contains glycyrrhizin, a chemical that can trigger a dangerous drop in potassium levels. When potassium runs low, heart rhythms fluctuate and blood pressure can rise causing swelling, lethargy, even congestive heart failure.
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