From what I undertand, although it is true that fat lower the GI of carbs, food combing is about effective and efficient digestion and carbs do not digest well in the presence of fats. The other point is that the carbs will cause an insulin spike and when that happens the last thing you want around is fats which the insulin will then try to lay down as fat in your body.

I have no idea what the Dr K diet is.

Your details say you are following a Gluten-Free Casein-Free Diet Capmikee? I do not know if this is a food combing plan or not? sauerkraut is very low in carbs and I used to eat it when I was on Atkins so I see no problems eating it with anything.

Yes, I know law fat speads are processed and that butter is healthier but as the plan I'm following is low fat this is a compromise I think I can make. I eat very little of it anyway.