Frailty in the elderly develops under the combined action of physiological aging, chronic diseases and life context. Malnutrition is often the cause or consequence and engenders physiological alterations due to decreased food consumption, the ability to eat and access to food. The objective of this study is to analyze, in a rehabilitation and treatment center for the elderly, the results of two scores of nutritional risk screening, the Nutritional Risk Screening (NRS) and the Mini Nutritional Assessment Short Form (MNA-SF) validated in the elderly and taking into account the clinical signs of fragility. In this study, the MNA-SF has a higher sensitivity and is the reference tool for routine screening in this population.