Since going low carb/primal things have greatly improved.I eat adequate veggies and very little fruit. I don't go out of my way to add fat for fat's sake. I also don't avoid it. Butter, bacon, cheese, olive oil, coconut oil are, off the top of my head, staples.
I also agree with sbhikes, big, sudden shifts will bring on a bout of diarrhea for me. I went off the rails for the weekend, a few weeks ago. That resulted in 2 days of needing to be near the bathroom. When things like that happen and I need to be out and about then my overall eating is curtailed and Imodium becomes my friend again.