Nadia B. Pietrzykowska, MD, FACP. Board certified Physician Nutrition Specialist and Obesity Medicine Specialist, with formal fellowship training and also a board certification in Internal Medicine. In hospital and outpatient care. Experienced in the medical management of obesity as well as perioperative and long term medical and nutritional management of patient undergoing bariatric surgery. Malnutrition and nutrition support focusing on patients with chronic and acute diseases of the gut.