Is editing food infringing?

That depends on what dish you edit. If you create it yourself, it won't be infringing. If you steal other people's videos and pictures, it's infringement.

If you just study, or imitate others to edit food, it is not infringement! Infringement means using other people's videos, music, pictures, expressions and some special fonts. Some things without copyright will constitute infringement!

So you should learn to distinguish, and don't use other people's materials directly.