Theoretical premises of the positive influence of including dietary fiber on the course of gastroesophageal reflux disease may be the fact that dietary fiber may absorb nitric oxide (NO) containing in food, which in turn has relaxing effects on the lower esophageal sphincter. In addition, fiber deficiency has been shown to be associated with increased chance of developing hiatal hernia, which is associated with greater risk of the disease manifestations. There is lack of data about diet modification with its enreaching by dietary fibers and their type on the symptoms frequency and objective (i.e. esophageal pH-impedance and manometric) parameters.