Acetone breath? Nice argumentation.

You’re just repeating what I said in another way:

1. yes, it will use it over fat, because it’s bad for us, so smartly we’ll use it up ASAP.

2. yes, other things (fat) will be used if you do not eat sugar.

Sugar is sugar, your idea about “natural” has no foothold in science, it’s the glycemic index you want.

Also, if your diet is your primary “fuel source” I wouldn’t like to be your arteries.