Also check out "potatoes not prozac" - fantastic book which explores the relationship between sugar/mood/weight and addiction.

Sugar acts on the body like a drug, it works on exactly the same receptors as opiods in the brain.

But try cutting it out and its almost impossible unless you go raw - i tried this a few years ago and sugar is in virtually everything on your supermarket shelf. And what happens is you accidentally consume some, even a tiny amount and it sets off huge cravings for more.