I'd make an effort. It shouldn't be incredibly difficult. For instance, turkey's usually a safe bet, and that's the main part of Thanksgiving dinner (well, except for vegetarians, but still!) As far as the side dishes, my mother is diabetic and we've made sugar-free cranberry sauce and pumpkin pie this year.
Both of them turned out excellent -- in fact, a quarter of the pumpkin pie is currently "missing"! A simple Google search will turn up tons of recipes -- that's how we found ours. Seriously, though, there's usually more than enough food to go around during Thanksgiving anyway, and I don't know anyone who eats it all.
Your friend's husband should be able to find at least some things he can eat without harm.
I would have thought perhaps you would have to do so before recently being diagnosed with gestational diabetes and having to learn to eat like a diabetic. Really there would be no extra cooking involved. Part of diabetic diet is learning to balance foods not just avoid them altogether.
While sugar-free or low carb alternatives are nice for diabetics they're not required. He should have no problem choosing food item combination that work from a plain old thanksgiving dinner.
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