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He said studies had shown glycyrrhizic acid - the active ingredient in liquorice - could cause "hypertension, hypokalemia, metabolic alkalosis, fatal arrhythmias, and renal failure" - all of which were seen in this patient.

Today overhydration and sudden death from hyponatremia and hypokalemia are serious problems, not dehydration.

Symptoms of hypokalemia can include abnormal heart rhythms, according to the U.S.

He wrote: "Further investigation revealed a recent change to a liquorice-containing candy as the likely cause of his hypokalemia."