It was determined that students aged 7-10 years spent 1.9 times more time switching attention than students aged 11-15 years in both groups with different school meal schemes (139.3±0.90 seconds versus 264.3±1.39 seconds; P<0.05). According to the results of the assessment of attention stability, it was found that the accuracy coefficient of task completion in students of the 1st group was 1.5 times higher than in students of the 2nd group of children aged 7-10 years (0.60±0.04 vs 0.40±0.01; R<0.001) and 1.4 times higher in children aged 11-15 years (0.55±0.04 against 0.40±0.01; R<0.001).