In this functional magnetic resonance imaging study, effects of different information of fat content of high or low fat will be examined in FD patients and healthy volunteers (n=30, respectively). These data will provide a better understanding of symptom generation following food ingestion in general as well as in patients with respective functional gastrointestinal disorders.

Inclusion Criteria:

• Male and female, volunteering adults BMI: 18-25 kg/m² right-handed Age: 18-65 years Capacity to give informed consent

For FD patients, Diagnosis of functional dyspepsia over the last 12 months certified by a medical record Inconspicuous gastroscopy during the last 6 months certified by a medical record

Exclusion Criteria:

• Subjects which have a non-removable metal object in or at their body, such as, for example:
• Heart pace-maker,
• Artificial heart valve,
• Metal prosthesis,
• Metallic implants (screws, plates from operations, etc.),
• Interuterine Spiral,
• Metalsplinters / grenade fragments
• Non-removable dental braces,
• Acupuncture needles,
• Insulin pump,
• Intraport, etc., Pregnant women or pregnancy cannot be excluded Nursing women Subjects with limited temperature perception and/or increased sensitivity to warming of the body A circulatory disease cannot be excluded Subjects with hearing-disease or an increased sensitivity to loud noises Subjects with fear of closed-in places (claustrophobia) Subjects which were operated less than three month ago Acute illness or infection Neurological disorder or injury (e.g. epilepsy) Moderate or severe head injury Severe psychotic illness (e.g. schizophrenia, depression) Intake of antidepressants / antipsychotics Vegetarians/Vegans Food allergies Self-reported eating disorder