What effect does the hole in the center of a donut have?
You don’t have enough to do. However, the donut hole was started because homemade donuts usually didn’t get done in the center and no one likes a soggy middle. Most donuts without holes are fried in a commercial deep fryer so the center is cooked. A hole-less donut has more calories as there is more donut. If it has a glaze or powder sugar on it then there are even more calories to it.