Severely ill patients usually present different degrees of inflammation, metabolic stress, comorbidities and haemodynamic instability that can result in reduced calorie and protein intake and increased energy expenditure. There are several reasons why oral ingestion may not be possible in these patients, such as dysphagia secondary to stroke, neuromuscular disease, Parkinson's disease, altered level of consciousness, mechanical ventilation and psychological and/or psychiatric factors, such as anorexia nervosa (Scott & Bowling, 2015). Accordingly, patients who are unable to meet their nutritional requirements may benefit from the use of enteral nu-