Gastroesophageal reflux disease (GERD) is a chronic condition, which may significantly decrease patients' quality of life due to the typical symptoms - heartburn and regurgitation. These are caused by increasing number of transient lower esophageal sphincter relaxations, regularly recurring reflux of gastric content into oesophagus, acidification of the esophagus and consequent esophageal mucosa damage. In addition, an important role is played by the increase in production of hydrochloric acid in the stomach, the slowdown in the evacuation of the contents from the stomach and increase of gastric and intra-abdominal pressure. All of these factors may depend on the patient's diet.