Determining gastric mapping for dysplasia and intestinal metaplasia in obese who are at increased risk of gastric cancer due to their obesity can be of value for determining places with higher probability of such pathologies and doing biopsy from these locations during endoscopy. Such mapping can also be helpful in better follow up of these patients for early diagnosis of cancerous lesions. This quasi-experimental study, will be done on 174 obese cases candidate for bariatric surgery who have tendency for doing gastric endoscopy with biopsy and aged between 18 and 70 years old. A general practitioner will evaluate demographic variables and determine height and weight. All patients who sign an informed consent form will be endoscopically evaluated and gastric biopsy will be done. CBC, platelet, ESR, CRP, FBS, TG, Chol, HDL, and LDL will also be determined after taking blood sample. Endoscopy will be done before surgery under sedation with propofol and after confirming by a cardiologist. Our outcome variables are: H. pylori infection, mucosal atrophy, chronic gastritis, reactive atypia of glandular epithelium, intestinal metaplasia, dysplasia, CBC, platelet, ESR, CRP, FBS, TG, Chol, HDL, and LDL.