TY JOUR TI The concept of balanced nutrition as a factor for optimal physical condition KW health KW healthy nutrition KW physical condition KW physical activity KW body mass index KW students KW physical education JO Scientific notes of P. F. Lesgaft University AU Schetinina, S.Y. PY 2025 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft