Have no special expertise, but did watch shows about the brain and read about it.
Addiction originates in the brain. Feel good reactions occur there and the cravings become established. We know that about alcohol, drugs, food, etc. We crave good feelings. Sugar can have the same effect. My guess is we're stuck with it. We can figure out what is our worst weakness (candy bars, cookies, cake, etc.) and never even start with it. Don't bring it in.