Study of Gastric Motility in Eosinophilic Gastritis

Inclusion Criteria: * Eosinophilic gastritis (EG) defined as at least one endoscopy with histopathologic evidence of ≥ 30 eosinophils in 5 or more high powered fields (hpf's) with associated symptoms of EG. * Patient reported symptoms starting at least one year or more prior to screening consistent with a diagnosis of EG: nausea, vomiting, early satiety, abdominal pain/bloating, regurgitation, diarrhea. * Symptoms suggestive of a possible gastric motility disorder during the 60 days prior to screening including: nausea, vomiting, early satiety, post-prandial feeling of fullness or bloating. * Tolerance and willingness to consume the oatmeal meal in this study. Exclusion Criteria: * Diagnosis of eosinophilic enteritis. * Inflammatory bowel disease (e.g., Crohn's disease or ulcerative colitis). * Known disorders associated with eosinophilic gastrointestinal (GI) diseases (e.g., D 816 V Kit+ systemic mastocytosis, Marfan syndrome or Loey's Dietz Syndrome). * Known inflammatory or autoimmune disorders associated with gastric dysmotility such as systemic sclerosis, lupus or eosinophilic fasciitis. * Uncontrolled diabetes or known diabetic complications of gastroparesis, neuropathy or nephropathy. * Taking opioid agents in the 2 weeks prior to screening and throughout the study. * History of strictures in the small bowel or stomach (e.g., pyloric stenosis) or gastric surgeries or procedures such as pyloromyotomy, pyloric dilation, pyloric resection, vagotomy, bariatric surgery or post-Nissen fundoplication or antrectomy with Billroth I, Billroth II or Roux-en-Y gastrojejunostomy. * Past or current medical problems or findings such as: advanced liver disease (Child's B or C), acute or chronic renal disease (serum creatinine \> 3 mg/dL), neurologic disease (e.g., dysautonomia), achalasia and adrenal insufficiency.