To answer this question a study was done in 64 people who volunteered to eat specific amounts of licorice each day for two to four weeks. Licorice intake ranged from 50g a day (about the size of a few jellybeans) to 200g (about the size of a Mars Bar). At the end of two weeks, people in all three groups had higher blood pressure. The larger the portion of licorice, the higher the rise in blood pressure. If you have high blood pressure and don�t want to give up licorice, switch to red licorice which contains cherry flavoring, but not any real licorice.
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