Jo,
I agree about the deprivation aspect. It seems to be too much of a 'hit' when I finally got into the celebration swing of things... however for me to lose and get back to a reasonable goal, I have to be on Cruise to get there and even this is slow enough.
What I wonder might benefit me is if I have one meal a week - almost like a dummies celebration meal - where I add in something Conso-ish, like a piece of fruit, or cheese or bread or a starch like beans, or one of the disallowed vegetables, one of those 'allowed' extras that resembles a 'treat' (I know, it sounds like I'm training a dog here) without actually being something that will drive me into that kind of carb-head frenzy.
I wonder if that might simulate the pattern of a celebration without really being anything fatty or calorific enough to seriously interfere with what I have left to lose. Along those lines I have started adding milk powder in a couple of times a week to my galette, as I am still on dairy-free, I find that ANY milk or yoghurt seriously gives me stomach problems, but the milk powder I seem to be OK with - and it almost serves as a cheaty little extra, too.
I know I am over analysing this to a great extent but I want this to work.
On another note, I had an appointment this week re my PCOS and was given a leaflet informing me of the necessary diet PCOS sufferers are advised to follow for their health and dietary reasons, all in reference to bloog sugar levels, insulin resistance, possible diabetes and so forth:
Whole grains and whole meal only based produce, lean protein, fruit and vegetables. Avoid sugar.
I was so pleased when I read that - I thought it may as well have flat out said 'follow the Dukan diet'. That whole thing reinforces for me that starting Dukan was definitely the right thing for me to do - hey it's actually a medically advised diet! - and it clearly needs to be long term for me, for health reasons and for potential future problems too, aside from a desire to just be slimmer; I just need to work out how to manage it properly.
Yesterday:
B: Salmon fillet and spinach
L: Chicken and salad
D: Chicken curry (surprisingly successful) and mixed vegetables - mushroom, marrow, courgette and spinach.
S: Oatbran galette w/milk powder
Exercise: Moderate walk.
Out of curiosity... if you have something un-Dukan, is it worse to go higher sugar or higher fat? What would it be less damaging to have, a piece of cheese (higher fat) or a piece of pineapple (higher sugar), for example?
Oh and about the Hersheys - I just don't think of it as chocolate. It's like a new, magical substance that doesn't quite fit into any known food group - but I love it!
I never have a temptation towards junk food (or at least the mac and cheese!!!) just sweet things... a US-import shop just opened up here in town and I am doing my best to avoid it! 
