36Accordingly, it must be noted that although, in the context of proceedings referred to in Article 267 TFEU, which are based on a clear separation of functions between the national courts and the Court of Justice, it is for those courts, which alone have jurisdiction, inter alia, to establish and assess the facts, to determine, in particular, whether or not a nutrition monitoring service provided under conditions such as those at issue in the main proceedings constitutes a supply of services independent of physical well-being and fitness services and to make all definitive findings of fact in that regard (judgement of 19 December 2018, Mailat, C‑17/18, EU:C:2018:1038, paragraph 35 and the case-law cited), the Court may provide the national courts with all the guidance as to the interpretation of EU law which may be of assistance in adjudicating on the case pending before them (judgment of 17 January 2013, BGŻ Leasing, C‑224/11, EU:C:2013:15, paragraph 33). From that point of view, the following considerations ought to be noted.
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