Happy to take criticism / suggestion. In my instance, he was grumbly when I went nearby when he was eating. It wasn't a full growl, and I took it that he was registering his displeasure and warning me away while he was eating. I would never interfere with a dog eating, but he didn't know that and I wanted to make him more comfortable having people in the room. There are no children here, but they do visit so I wanted him to be more confident. I think I mentioned that he was a rescue and was probably feeling a little unsettled.
So, when it came to meal time, I sat with bowl on lap, and some food in hand, he bounded over without any hesitation and I gave him some from my hand, put some in the bowl, and he ate it where it was. Couple of these and I am now able to move freely around him while he eats.
I am working on my level 6 behaviour course now, and although I'm not that far in, I haven't encountered anything that would suggest this wasn't appropriate, so very interested in your opinion.
As with all things, and what makes forums like this challenging, is that there are so many signs we see and take into consideration before taking action that either we don't think about consciously, or can't articulate in short order in a post. In my example above, I didn't have any suspicion that he didn't trust me as his recall was good, he would happily sit with / on me, etc. No signs other than him finding his feet in the house. Also, he'd been with us for 2 months before I bothered to do anything as I wanted him to just get used to his new home.