**2. Materials and Methods**

The study was conducted in the Province BAT during the 2018–2019 school year (September 2018–June 2019) by the Food Hygiene and Nutrition Service (SIAN) of the Prevention Department of the Local Health Unit (LHU). The investigation was performed in accordance with the World Medical Association Declaration of Helsinki and did not include any experiments involving human or biological human samples, nor research on identifiable human data. Regardless, the study protocol was approved, also with regard to ethical issues, by the Regional Sanitary Authority (approval no. 238\_2018).
