If you are eating a low-carb diet then I personally would just eat something! I find that one of the freedoms of low-carb is, for the first time in my adult life, I do not have food cravings and I have broken the link between eating and emotional reward. So if I feel hungry, it’s a real hunger and not just a need to stuff my face because I’m craving carbs, or bored, or depressed. So I eat something suitably low-carb, maybe a bit of cheese or cold meat. Or, if the timing is appropriate, just bring my meal forward.
The reverse of this is that if I am not hungry then I don’t eat! So no snacking unless genuinely hungry and often, only one meal a day. It all sounds terribly worthy, but actually, it just happens naturally for me. I do make sure I eat enough of the right foods for my meals to largely avoid mistimed hunger.