They say sugar does similar things to your brain that recreational drugs do. It gives you that "hit" and that pleasurable high, and it's addictive.
In my experience is an the best way to reduce cravings it put yourself on a low carb diet. You can still eat enough protein and fat to maintain your weight. Two or three weeks off the sugar and the cravings should be gone. There are a few sites with databases of food that give you a good way to track carbs without being on a "diet" per se.