We report the case of a 52-year old man with severe acute pancreatitis. In this case report we discuss the undesirable effects of parenteral nutrition and the importance of nutritional support at patients with severe necrotizing pancreatitis. Severe acute pancreatitis is usually accompanied by systemic inflammatory response syndrome, which results in hypermetabolism with prominent protein catabolism. Providing nutrition to these patients is of paramount importance. An adequate nutritional support is crucial in patients with severe and complicated pancreatitis. A negative energy balance has a negative impact on the nutritional status and the disease progression.