Good day.
Answering the question of the topic, it is necessary to take into account the time you expect to spend at the poker table and the type of game.
In my opinion, if we are talking about cash games, then there is no point in this, because you can get up from the table at any time, and therefore you can have a snack outside the table and during the game you may only need water (or other drink).
If we are talking about multi-hour tournaments, then, in my opinion, a small snack is acceptable.
I'm not talking about some kind of full-fledged food. I mean, for example, a bar of chocolate.
Despite the fact that there are breaks in tournaments, there are a number of reasons why you may need a small snack. The main reason may be health-related reasons. In this regard, I do not think that anyone can be offended if you eat, for example, a slice of chocolate to increase blood sugar levels.
All that is needed, in my opinion, is to make sure that your snack does not cause inconvenience to others: no crunchy, rustling and noisy products.
A small container in which you put a pre-unpacked and divided into small pieces of a chocolate bar, so that you can easily open the container and put this piece in your mouth. it can also be other food, pre-prepared in such a way, perhaps a fruit (for example, a banana, pre-peeled, divided into pieces and poured with lemon, so that it looks attractive without losing color😅).
And of course a napkin that will help you keep your hands clean.
For a thorough snack, of course, there is a break.