Background. Poor nutritional status (PNS) is a modifiable factor determining disorders of the body composition – sarcopenia, obesity and sarcopenic obesity (SO). Aim: to assess the prevalence of sarcopenia, obesity, sarcopenic obesity and their relationship with PNS. Materials and methods. The study included 211 people over the age of 60. All patients were collected complaints, anamnesis, anthropometric data (height, weight, body mass index (BMI), mid-shoulder circumference, calf circumference). Assessment of nutrition status was studied using the Mini Nutrition Assessment (MNA) questionnaire, its short (MNA-SF) and long forms (MNA-LF). Body composition was analyzed by bioimpedance analysis (BIA). The strength of the muscles of the upper extremities was assessed using the handgrip strength (HGS) using a dynamometer. The strength of the muscles of the lower extremities – using a five-sit-to-stand test from a chair (5-STS). Physical performance was determined using walking speed. Results. 49.8% of patients had impaired body composition (60.7% of men and 42.5% of women); sarcopenia, obesity and SO were diagnosed in 10%, 32.7% and 7.1% of the examined, respectively. PNS was detected in 31.3% of the study sample. The prevalence of PNS varied depending on the phenotype: 81% in sarcopenia, 60% in SO, 14.5% in obesity and 28.3% in the group of normal body composition. Conclusions. People over 60 years of age, violations of the compositional composition of the body prevail. Sarcopenia and SO are often associated with PNS. Timely therapeutic and preventive measures of these conditions improve the vital activity and quality of life of elderly and senile people.