The development of information technologies, their availability for every family, the transition to distance learning could not but affect health status of schoolchildren. In the past year, amid the spread of the new coronavirus infection, the time that schoolchildren spend with gadgets has significantly increased. The relevance of this study is determined by the evaluation of the ever-increasing and, as a rule, negative impact of computer technologies on the health of schoolchildren. The study aimed to investigate the features of the effect information technologies have on the well-being of high school students and to analyze the role teachers play in popularization of healthy lifestyle and reduction of the degree of influence of information technologies on health of modern schoolchildren.

The article describes the possibility of using the data on the health status and lifestyle self-assessment obtained during the questionnaire survey of high school students in the teacher's preventive activities aimed at preserving and improving the schoolchildren's health. The main indicators that according to the respondents determine their quality of life have been revealed, and health status is ranked only third. It has been found that 40% of students consider their health to be “good”, while 53% currently do not worry about their health at all. Certain characteristics of physical activity, nutrition, sleep schedule, prevalence of bad habits in students attending schools of various types are provided. Despite high subjective assessment of physical activity, only 8% of schoolchildren do morning excercises every day, most of students do not attend sports sections. More than 40% of students sleep less than seven hours, which has a negative effect on the adolescents' health. Evidence has been obtained that 19% of schoolchildren have tried vaping and 13% vape regularly, which is definitely worrisome.

No abstract