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FDA: Possible to overdose on black licorice

November 2, 2011
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As it turns out, you really can overdose on candy-or, at least, black licorice.

The Food and Drug Administration (FDA) encourages moderation if you enjoy snacking on the old fashioned favorite, especially if you’re 40 or older.

The FDA says 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.

That’s because 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.

FDA’s Linda Katz, M.D., says last year the agency received a report of a black licorice aficionado who had a problem after eating the candy. And several medical journals have linked black licorice to health problems in people older than 40, some of whom had a history of heart disease and/or high blood pressure.

Katz says potassium levels usually are restored with no permanent health problems when people simply stop eating the licorice.

Licorice, or liquorice, is a low-growing shrub mostly grown for commercial use in Greece, Turkey, and Asia. The National Institutes of Health (NIH) says the plant’s root has a long history of use as a folk or traditional remedy in both Eastern and Western medicine. It has been used as a treatment for heartburn, stomach ulcers, bronchitis, sore throat, cough and some infections caused by viruses, such as hepatitis; however, NIH says there are insufficient data available to determine if licorice is effective in treating any medical condition.

Licorice is also used as a flavoring in food. Many “licorice” or “licorice flavor” products manufactured in the United States do not contain any licorice. Instead, they contain anise oil, which has the same smell and taste. Licorice root that is sold as a dietary supplement can be found with the glycyrrhizin removed, resulting in a product known as deglycyrrhizinated licorice, or DGL, NIH says.

If you have a fondness for black licorice, FDA is offering this advice:

● No matter what your age, don’t eat large amounts of black licorice at one time.

● If you have been eating a lot of black licorice and have an irregular heart rhythm or muscle weakness, stop eating it immediately and contact a healthcare provider.

● Black licorice can interact with some medications, herbs and dietary supplements. Consult a health care professional with questions about possible interactions with a drug or supplement you take.

● If you’ve experienced any problems after eating licorice, contact the FDA consumer complaint coordinator in your area.

For more information, visit http://www.fda.gov/.

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