Healthy nutrition affects mental well-being and is important for increasing stress resistance. The objective is to evaluate the effectiveness of optimizing the nutrition of workers with a multi-component product made from plant materials for different durations of intense mental work. Physiological and hygienic testing was conducted on the psychodiagnostic complex «Multipsychometer» of men engaged in mental work, divided into two groups: duration up to 10 (No. 1) and more (No. 2) years. Their working conditions were assessed. Persons of the main (nn = 13 and 17) groups took a natural product made from plant materials, comparison groups (nn = 13 and 17) ate as usual. In the initial state and on the 22nd day, professionally important qualities were assessed according to G. Isaac and Spielberg. Labor had a negative impact on the psychological state: in those employed for up to 10 years, changes were determined by self-assessment of wellbeing and mental activity; in those employed for more than 10 years, 41.2 % had unsatisfactory well-being and mental activity, 35.3 % had decreased motivation, and 11.8 % had high situational anxiety. The impact of labor was confirmed by the results of repeated testing in comparison groups No. 1 and No. 2: in the first, well-being and physical activity worsened, while in the second, situational anxiety increased. Optimization of the diet with a multicomponent product showed a statistically significant difference in the «well-being» and «motivation» indicators in the group of individuals with up to 10 years of work experience; according to individual indicators, there was an increase in self-assessment: «well-being is satisfactory,» physical activity is «above average,» and mental activity is «average.» In the group with longer work experience, statistically significant improvement in well-being and physical activity was established; according to individual data — improvement in well-being, physical activity, increased stress resistance. Optimization of nutrition allows to reduce the risk of the influence of working conditions on the intensity of the work process on the health of workers.
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