Yes, salmon has one of the highest contents of fat in terms of fishes... 3.5 oz of salmon has about 7 grams of fat. I typically eat it once a week and am fine with it though. I eat skinless, boneless grilled chicken breasts the rest of the week which has only 3 grams....
So, it is possible that the fat from the butter on the beans just put me over the top in terms of the amount of fat I can safely eat. I have no idea. I've only been following the diet for a month now so I'm sure I have plenty to learn yet. I just know that I eat salmon once every week with no problems, so I assume it was the butter on the beans that caused my problem on this particular day - since that was the first time I've had butter since following the diet.
-------------------- Jeanette IBS-D, then switched to IBS-A, now stable with Udo's Choice Super Bifido Plus Probiotic