BACKGROUND AND OBJECTIVES: The purpose of this review is to approach the main necessary aspects for the accomplishment of safety and efficient nutritional therapy to the critically ill patient. CONTENTS: Bibliographical survey with didactic books and scientific articles was made in Portuguese, English and Spanish with results of the last 20 years. Nutritional support is an integrant part in the care of patients in intensive care units. The success of the nutritional therapy involves the stages of nutritional assessment, determines the route of diet infusion and the calories and nutrients needs. CONCLUSIONS: The use of nutrients with immune function (immunonutrients) is each more frequents, however, its use is not well established for critical illness. More clinical studies are necessary to establish the best form to nourish the critical ill patient.
critical ill patient; enteral nutrition; immunonutrition; nutritional therapy; parenteral nutrition