 Specific objectives include assessing whether patients with GRD and Barretts esophagus have altered esophageal reflux extent, frequency, and type assessed by pH-impedance; altered symptom profiles; differential esophageal body and sphincter pressures assessed by manometry; aberrant gastroduodenal motility assessed by videofluoroscopy in comparison to patients with BE and no GRD. Finally a gluten free diet will be instituted to assess whether a gluten-free diet alters esophageal reflux extent, frequency, and type or symptom profiles in those with BE with and without a GRD. 