Recording the exact weight and height should represent a standard practice for all inpatients, as they significantly impact on patients' care, drug dosing and nutritional assessment.

However, these measurements are recorded in a small percentage of inpatients and, even worse, they often are estimated by nurses or Physicians, or self-reported by patients. This error may contribute to a wrong nutritional assessment, since the body mass index (BMI) is one of the parameters included in some of the most used nutritional scores.

In this study the investigators will perform a nutritional assessement, at hospital admission, in a group of inpatients by the mini-nutritional assessment short form (MNA-SF), by means of estimated, self-reported and exact body weight measures.

Moreover, in those subjects with a malnutrition diagnosis (by MNA-SF) the investigators will perform bioimpedence analysis and will evaluate a series of anthropometric measurements offering insights into body composition and distribution of fat and muscle, such as calf, waist and hip circumference.

Inclusion Criteria:

• Patients of both sexes with free and informed consent.
• Age 65 or older (in line with the World Health Organization definition and the recommendations of the ESPEN guidelines for geriatric nutritional assessment).

Exclusion Criteria:

• Inability or unwillingness to provide informed consent.
• Severe cognitive impairment.
• Language or communication barriers.
• Clinical or logistical conditions that make objective measurement of weight and/or height impossible (e.g., non-transferable bedridden status, clinical instability, risk to the patient).
• Clinical judgment of unsuitability, at the discretion of the physician responsible for the study