It is true that whilst I am very much friends with peanut butter, "peanut butter is not my friend !". I have noticed that for a week or so we were out of peanut butter and during that same period my weight has begun to drop a little... no coincidence I fear. I am not crazy about weights measurements, though I clearly weigh myself more than someone who doesn't think about such things, and it's only a subtle trend so I am watching it to see what happens.
I have also cut out butter / spread on toast in the mornings, perhaps its more a case that... butter is not my friend ! ;o)