53Furthermore, since Article 36 of the EC Treaty (now, after amendment, Article 30 EC) provides for an exception, to be interpreted strictly, to the rule of free movement of goods within the Community, it is for the national authorities which invoke it to show in each case, in the light of national nutritional habits and in the light of the results of international scientific research, that their rules are necessary to give effective protection to the interests referred to in that provision and, in particular, that the marketing of the products in question poses a real risk to public health (see Commission v Denmark, paragraph 46).
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