I think this is the right default: every time you derail you start over at zero, with a “clean slate” so to speak. This corresponds very well to the importance of self-forgiveness. However, it can also sometimes create a bad incentive to binge—for example, once you have eaten two ice cream cones, you have already derailed and can’t make it any worse, so you might as well eat sixteen. This has been discussed a bit here: When I’ve already derailed . If that’s a problem for you, probably the easiest solution is to add some fine print to your goal saying that you have to count data points past derailment towards the next day (though you have to edit them manually).
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