Regarding recruitment of patients, it is estimated to include 1.5 patients a week (63 patients in a year based on 42 recruiting weeks in a year). The estimation is based on a point prevalence of malnutrition performed in 2016, where 12 patients out of the 72 screened patients 65 years and older (16.7%), had BMI <18.5. The calculation was based on a 10 % agreement of participation. To be even more cautious the investigators estimates a recruitment of 126 patients ,within 3 years, based on patients accessibility of 4000 new admissions a year.