It's a symptom of withdrawal - see page 82-83 of SPQP. When your appetite-control system is functioning properly it will go away. Meantime go for it! As long as doesn't contain fructose.
It might pay you to check that you are not ingesting a lot of "hidden" sugar, usually in processed foods. Reject anything over 2% "sugars" except yoghurts - OK to 5% which is lactose and is metabolised to glucose.
Also, David recommends NOT substituting glucose for sucrose during the withdrawal period.
Hang in there! It won't last for long :-)
JohnN