Study of Dietary Patterns and Food Diversity in Russian GERD Patients

Inclusion Criteria: * willingness to participate (signed the informed consent form); * willingness to follow all the required procedures; Exclusion Criteria: * Pregnant or breast-feeding females; * Neoplasms, current or by the medical history (except local skin cancer successfully treated); * History of chest or abdominal surgery, except appendectomy and cholecistectomy (in case when no consequences of these operations like adhesive disease of the abdominal cavity are present); * Co-morbid conditions which can influence or mask the symptoms of GERD (including, but not limited to: ischaemic heart disease, severe pulmonary disease, severe depression or anxiety, etc); * the use of concomitant medications that may influence on the symptoms or other manifestations of gastroesophageal reflux disease: NSAIDs, corticosteroids (except topic ones for no longer than 2 weeks), any medications directly influencing mood and function of central nervous system (antidepressants, anxiolytics, anti-anxiety agents, anticonvulsant etc) at the moment of enrolment and during a 2 half-life period of the certain drug; * the use of medications that influence gastric secretion at the time of enrolment and during 2 week before it; * any condition of the patient which makes the participation of the patient in the study unreasonable or put him at risk of the condition's exacerbation