The University of Maryland Medical Center recommends limiting your consumption to 4 grams of ginger, in any form, per day. While side effects from eating ginger are rare, ginger is considered safe to eat regularly. Eating too much can irritate your stomach, however, as well as cause heartburn and irritation in your mouth and esophagus. It can also lead to diarrhea. If you have gallstones, diabetes or are about to go into surgery — and are regularly consuming large quantities of ginger — let your doctor know beforehand. Ginger can sometimes also affect diabetes and blood pressure medication, as well as blood-thinning medication, so let your health care provider know before you start eating crystallized ginger on a regular basis.
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