Accurate nutritional and fluid evaluation at the time of disease diagnosis and during medical nutritional treatment follow-up is necessary. However, nutritional evaluation is not a routine practice in the clinical setting and procedures need to be standardized. Also, tools used in the general population, such as biomarkers and anthropometric measures, maybe not be reliable in the context of chronic diseases such as heart failure, renal failure, liver disease, arthritis, and cancer, where malnutrition may coexist with fluid overload and systemic inflammation that may be hindering changes in body cell mass. Thus, identifying additional nutritional assessment tools to properly identify such as bioelectrical impedance vectorial analysis is crucial for diagnosis and monitoring.<br /> We propose a collection of videos that describes how to employ phase angle and bioelectrical impedance vectorial analysis to evaluate nutritional and fluid status in clinical practice, including patients with chronic disease and fluid retention or disturbances.