Even though all the tools we used in our study to classify malnutrition were associated with worse values regarding analysis (albumin, prealbumin, CRP, Glasgow prognostic score), weight (BMI), and length of hospital stay (approximately three more days), the only ones that were significantly associated with increased mortality in both the short and long term were SGA and GLIM criteria (using FFMI and HGS). The gene discussed is CRP; the disease is nutritional deficiency disease.