Pilot Study to Evaluate Magnetic Marker Imaging on Diabetic Polyneuropathy and Gastroparesis

Inclusion Criteria: * age \> 50 years * written informed consent * Diabetes mellitus (only Diabetes mellitus group) * Symptoms of diabetic gastroparesis with respect to nausea, postprandial fullness, abdominal pain, nausea, vomiting, abdominal bloating, early satiety, erratic blood glucose levels and weight loss evaluated by a standardized questionnaire (only Diabetes mellitus group) * actually measured HbA1c (only Diabetes mellitus group) Exclusion Criteria: * Subject who is pregnant or breast feeding. * Subject unwilling or unable to comply with study requirements. * Any investigational agent or participation in another clinical trial within 28 days prior to randomization * Any kind of disorder that compromises the ability of the subject to give written informed consent and/or comply with the study procedures. * History of any medical condition that may increase the risks associated with study participation or may interfere with the interpretation of the study results. * Known allergy to the investigational product, to any of its excipients * Active inflammatory bowel disease, serious gastric ulceration or other bowel diseases like e.g. coeliac disease * Implanted cardiac cardioverter-defibrillator or cardiac pacemaker * Stenosis or stricture of gastrointestinal tract or any surgery in this region except for cholecystectomy or appendectomy * Long-term medication with drug, that influence gastrointestinal motility (opiate, opioids, erythromycin, metoclopramide, laxatives) \< 3 days before randomisation and before magnetic marker monitoring