Dairy product consumption, eating habits, sedentary behaviour and physical activity association with bone mineral density among adolescent boys: a cross-sectional observational study.

"Declarations Ethics approval and consent to participateThe study was approved by the appropriate institutional review board. The project is in compliance with the principles of bioethics, as confirmed by the Bioethics Committee of the National Institute of Public Health, National Institute of Hygiene in Warsaw (protocol number 1/2021). The work was carried out in accordance with the Code of Ethics of the World Medical Association (Declaration of Helsinki) for experiments involving humans. Participants were sent a written informed consent form in advance of the survey. All participants gave their informed consent for participation in the survey. All participants received the results of the densitometry test, along with a discussion of them. Consent for publicationNot applicable. Competing interestsThe authors declare that they have no competing interests. Competing interests The authors declare that they have no competing interests."

"Funding This research was financed by the Ministry of Science and Higher Education in 2020/2022 as part of the Scientific School of the University of Physical Education in Warsaw: SN No. 5 "Biomedical determinants of physical fitness and sports training in adult population" and the statutory grant of the Wrocław Medical University (SUBZ.E250.24.042)."