INTRODUCTION: Nutritional care is an essential part for the integral follow-up of the growing elderly population, especially in the presence of chronic and neurodegenerative diseases and psychiatric morbidities. The Mini Nutrition Assessment (MAN®) has been used for this purpose, and in some situations, additional information to this tool is necessary. OBJECTIVES: To characterize the nutritional status of elderly patients in a geriatric neuropsychiatry clinic. METHODS: A randomly selected convenience sample was obtained among elderly patients diagnosed with depression (DEP), Alzheimer's disease (AD) and other psychiatric disorders (OTP). The nutritional status was evaluated through MAN®, body mass index (BMI = weight / height 2) and circumference of arm (CB) and calf (CP). The data referring to the consumption of medicines were also obtained, considering as polypharmacy the consumption of more than three medications/day. The data of medical diagnosis and laboratory tests were obtained from the medical record. A total of 217 individuals were evaluated, distributed according to the clinical diagnosis: DEP = 107 (49.3%); Group DA = 59 (27.2%) and OTP group = 51 (23.5%). RESULTS: The MAN® score identified nutritional risk in 67.3%, 69.5% and 54.9%, and malnutrition in 14.0%, 13.6% and 27.5% of the patients in DEP, DA and OTP respectively. Low weight, evaluated by BMI, was observed in 29.0% (DEP), 24.1% (AD) and 45.1% (BTP) of the evaluated patients. The prevalence of anemia was 11.2% (DEP), 10.2% (AD) and 19.6% (OTP); Being more frequent in women in DEP and OTP and in men in AD. The mean for vitamin D in all groups was in the insufficiency. The presence of total cholesterol above the normality intervals was 47.0% (DEP), 36.3% (DA) and 31.8% (OTP). Hyperglycemia was observed in 52,9% (DEP), 48,1% (AD) and 41,6% (OTP) of the patients. Polypharmacy was observed in 18.7% (DEP), 15.2% (DA) and 19.6% (OTP). There was no significant association between drug use and nutritional status, although there was a trend towards malnutrition with the use of drugs to treat depression (selective serotonin reuptake inhibitors), dementias (cholinesterase inhibitors), Omeprazole hydrochloride and sleep inducers. CONCLUSIONS: nutritional risk and malnutrition are prevalent in the population studied, regardless of the specific group of neuropsychiatric disease or dementia. These findings demand and justify a permanent nutritional monitoring for these individuals, since they are accompanied by other specific deficiencies that compromise health in general, such as anemia and insufficiency of vitamin D. The elaboration of educational plans involving patients, caregivers and The medical team, could contribute to the improvement of these conditions.