Looking at my Dreamfields Pasta, the nutritional info says that per serving it has 42 carbs and 5 gms of fiber. Then it also says that there are 37 protected carbs, so the digestible carbs per serving are 5.

I don't understand. Should I really be counting only 5 per serving, or should it be 37? What's a protected carb?

forgive me if this question has already been answered a thousand times - I couldn't find it in a search.