In Norway it is required by law to apply a standardized label to all advertising in which body shape, size, or skin is altered through retouching or other manipulation.

The rest of that paragraph:

However, in some cases, the picture or film must be labeled when such removal has been done. In this assessment, one must look at how extensive the removal is on, especially, the skin

If the amount of yogurt, crumbs, or snot is extensive, then it could be considered as a natural part of the body.

note: I wanted to add that I'm not trying to tear down this action on advertising. I think it's fantastic and hugely important. I only fear it will be on everything and people will desensitize from it real quick. I hope then another "natural image" label gets created

Kind of ridiculous, a photograph is already an alteration of reality. Lens perspective, physical crop, composition, exposure ... Be real