David's book only says no, if you are cutting down gradually.  Basically, if you're really gagging for something sweet, dextrose is not addictive and sugar is.  If you eat so much that you don't lose weight, you will still be getting through withdrawal.  I say, try to have one sweet a week with dextrose ( which is what I do ), but do it right away, if you feel you need to.

At the end of the day, any thing you need to do to get through withdrawal, is worth it.  The whole point of all this is that your body can regulate what you eat, if you let it.  There's therefore no reason to ever feel guilty, you do what you need to, to get through withdrawal, and then you listen to what your body tells you.  Self control and going hungry has nothing to do with it.