Inclusion Criteria:  Patients referred by their treating physician to the Department of Psychiatry and Psychosomatic of the Clinic Arlesheim waiting for the in-stay Expected waiting time until in-stay is at least two weeks Patients having anxiety symptoms as measured by the GAD-2 questionnaire (cut-off of 3 points) Patients'state of health allows them to complete the questionnaire on their own Signed informed consent No treatment with BP during the last two months No planned doses increase of (conventional) anxiolytics or antidepressants for the duration of the period until in-stay Age over 18 years Good German knowledge (at least level B2 from Common European Framework of Reference for Languages)  Exclusion Criteria:  Wheat allergies Acute life-threatening conditions Withdrawal of informed consent