Well, Chief, they are called sweet potatoes for a reason.... I agree that when baked well they turn into delicious sugar bombs.
I agree that diabetics, or folks cautious about glycemic index might do very well to be cautious of this tuber.
We are very non-typical, and I don't want to inspire envy, but the doctor told us that my Beloved Wife and I both could stand to gain about five pounds each. One of the reasons I like sweet potatoes is they have a great caloric punch. When I am able to make a fire they are a great camping food. (they don't do well on a propane stove, unfortunately). If you give them the cooking time, they have a great weight to caloric load ratio.
And, of course, marshmallows on top helps enormously.
sourdough isn't a recipe, it is a process.