The Malnutrition Screening Tool (MST) [20], Controlling Nutritional Status (CONUT) [21,22], Geriatric Nutritional Risk Index (GNRI) [22,23], Malnutrition Universal Screening Tool (MUST) [24], body mass index (BMI) [25,26], serum albumin [12,16,26,27], prealbumin [27], total protein [27], vitamin D [23,27] and lymphocyte count [16] are also used. The gene discussed is TTR; the disease is malnutrition.