The principal reason for the algorithm implementation is the rate of underfed (receiving <80% of prescribed of energy and protein requirements) as a result of numerous causes 26% considered avoidable events, and the variation of the clinical practice. There's a universal consensus that the EN is the principal artificial way for the macro-micro nutrients delivery, it comes with the novelty "if the gut works, use it or prepare to lose it". The evidence shows that the EN is more physiological and when the patients received the optimal amount of EN the clinical outcomes (length of hospital stay, mortality and infection rates) can decrease significantly. In average 74% of the patients in the ICU that received EN are underfed, in Mexico 71% of the hospitalized patients with EN in non-critical areas are underfed, receiving only 61% of their energy requirements during their hospitalization.