The ten minutes
Here's the piece that makes the rest possible. When the pull arrives and you're not hungry, you give it ten minutes before you decide anything. Not ten minutes of gritted teeth. Ten minutes in which you do the ask, try the answer, and see what the feeling does on its own. This is my own method, and the reasoning behind it is in chapters 4 and 10.
The claim under test is chapter 4's. The relief you feel after eating is mostly the feeling fading by itself, with the food taking the credit. If that's right, then ten minutes without food should leave you feeling roughly as you'd have felt with it. The only way to know is to try, and the ten minutes are the trial.
So the pull comes at ten to four. You check for hunger. Not hungry. You ask, and it's stress, the email. You put the kettle on and stand at the window while it boils. You make the tea. You go back and write the first sentence of the reply. It's now about eight minutes past, and I'd invite you to look at the pull. In my observation it's usually smaller, and sometimes gone. The feeling is still there, but it's the ordinary discomfort of an unanswered email rather than the tight, urgent thing it was, and the tea is in your hand.
At ten past, decide. If you want the crackers, have them. I mean that. Sit down, put them on a plate, eat them with attention, and write down that you did. You did the ask and the ten minutes, and you chose to eat, and that's a different act from the visit. Most of the time, in my experience of the people who try this, the wish has gone, and the crackers are forgotten until you notice at six that you didn't have them.
Some things make the ten minutes easier. Doing the answer from chapter 16 during them, so they're not empty. Having the kettle as a default, so there's always something to do with your hands. Being out of the kitchen for most of them, since the fridge is a persuasive object. And not treating a visit at the end of them as a failure, because it isn't. It's a decision, made with information, after a wait. That's the opposite of the habit.
I'd suggest doing this without exception for two weeks, and keeping the notes. What you're building is evidence about your own feelings. After a fortnight you'll know which ones fade in ten minutes, which is most of them, and which don't. The ones that don't are the ones that need more than a kettle, and by then you'll know their names.
One caution. The ten minutes are for the pull. If you're hungry, there's no waiting. Delaying meals or snacks when you're actually hungry is a diet, and chapter 12 explained what diets do to this habit.