Wang YK, et al. - Experts aspired to examine the gastric juice malondialdehyde (MDA) levels in relation to Helicobacter pylori (H. pylori) infection and associated gastric diseases. In case of H. pylori infection and associated gastric diseases, malondialdehyde in gastric juice could be used as a potential diagnostic biomarker. The gastric juice MDA levels increased proportionally with the severity of gastric diseases.