Carla, thanks for your post about being polite--how timely!
My husband and I have been invited to someone's house for dinner next weekend, the first time since we've been on plan. They asked if we had any particular food issues and we told them we are only eating protein and veggies and not eating carbs or sugar. They said, "no problem" but I know that most people will still thing bbq ribs or chicken marsala or all kinds of other things fall into the "OK" category.
It kind of reminds me of the old Monty Python skit where no matter what you order, it comes with spam...("spam, eggs, sausage and spam")
I don't know these folks very well, and they are kind of important to my husband career-wise, so I'm really worried about appearing rude. I've been practicing a variety of "no thank yous" for 2 days!