Gillian
Jackie, my guess is that you are really enjoying the fat and maybe especially the full-fat foods, after not having them for quite some time. This enjoyment awakens your desire for them (expectation of eating them) in particular circumstances and quantities. Yes?
So all you do is to work with your desire, maybe using Times and Plans, to address the overeating you’ve been doing with a different macronutrient (fats instead of carbs).
In that way, you teach yourself how to enjoy those yummy fats, and still eat less of them, in terms of frequency and quantity.
Let me know if you run into any problems.