What a good question, Sally. Are you really hungry or is it addictive behaviour? How about both at the same time?
I have two suggestions, and you may want to try one or both of these. One is to have some kind of snack available towards the end of your working day or on the way home as you may well be hungry then, whether you feel it or not. Good quality nuts, fruit, bit of cheese is what I’d have with me.
My other suggestion is to make sure there’s a similar snack available when you get home. Your addictive desire is for the carby bread, so you could work through that, while consuming something more healthy and less addictive.
Let me know if you try either of these and have any trouble with it.