An assessment of the dynamics of the body composition was made to study the effect of actual nutrition on the nutritional status of athletes of the women's and men's freestyle wrestling teams of the Republic of Buryatia (n=20). Anthropometric measurements were carried out according to the standard method. Actual nutrition was studied by the frequency. Sex differences were revealed both in the characteristics of the consumption of nutrients and energy, and in some anthropometric indicators. Results: gender differences were revealed: women differed in significantly lower weight, BMI. The energy value of the women's diet averaged 3123±337 kcal/day, which corresponded to the recommended values; in men, this indicator was lower than the physiological requirement and amounted to 3436±484 kcal/day, there was a tendency to change the component composition in athletes of both sexes after 16 days of the training camp: body weight increased due to increased fat and lean body mass and fluid content in the body. Conclusion: data from a portable bioimpedancemetry device is advisable to evaluate the nutritional status together with the actual nutrition of athletes in the field. To increase the effectiveness of the training process during the training camp nutritional correction using specialized food products for athletes is advisable.