I'm self pay so don't have to do the nutritionist thing, but I've seen three different NUT in the past. They were all supportive, but they never seemed to really **know** their stuff the way nurses and doctors do. I felt as though they were just giving rote responses parroted from a textbook somewhere, and their advice had all the depth of a Cosmo article (whoa, veggies are better snack choice than candy, no way!!!)
I'm sure there are fantastic NUT out there, but I felt like my gastroenterologist was more helpful. YMMV.