I'll pass this one to Joe.  I have no experience with freeze-dried.  But I like to speculate, so....

I would assume nutritionally it is identical to the same food which is not freeze-dried.  I would also assume freeze-dried items are heavy on the carbs due to the conventional nutritional wisdom.  That would account for the <ahem> tailwind generated by said products.

But again, I don't really know.  Those are just educated guesses.