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The most striking change in clinical presentation of celiac disease over time has been the decrease of diarrhea as the leading symptom and the progressive increase of other non-classical gastrointestinal symptoms (such as constipation, bloating and alternate bowel habits as well as gastro-esophageal reflux, nausea, vomiting and dyspepsia), a high proportion of celiac disease patients did not show any gastrointestinal symptom, but they displayed extra-intestinal manifestations such as iron-deficiency anemia, unexplained osteoporosis, abnormalities of liver-function tests and recurrent miscarriages.