Quality of life, dependency and mental health scales of interest to nutritional studies in the population.

Quality of life, dependency and mental health are multidimensional constructs that cannot be observed directly yet can be deduced in an indirect manner through indicators or profiles generated from questionnaires. These questionnaires are based on the validity of information transmitted by the respondents about perceptions, feelings and attitudes. For this reason, the information is difficult to contrast with and translate to a measuring system. The use of questionnaires or rapid quality of life and mental health evaluation scales involve a process directed towards an early identification of specific problems so as to establish medical treatment. This work will review the most commonly used scales or questionnaires in determining these variables and their relationship with the nutritional status of the population.