Although screening methods including the Universal Malnutrition Screening Tool (MUST), the Mini Nutrition Assessment (MNA) [23,50,51,52,53], the Prognostic Nutritional Index (PNI) [42,43,44], Instant Nutritional Assessment (INA) [54], Body Mass Index (BMI), weight, serum albumin, or blood lymphocyte count) are available, there is no “gold standard”. The gene discussed is ALB; the disease is malnutrition.