i think a "diet day off" is a bad term to use, its your lifestyle you should be changing and you cant really have a day off your life can you? having a binge every now and again wont help either, that means you are keeping the mindset that made you overweight in the first place. However if you are having a bad time of it and you feel like you want to give up i would suggest planning a day where you can maybe have something that usually you would restrict, keep portion size the same as when you are being strict as otherwise you will binge.
I was having a terrible time last night where i wanted to binge, i kept thinking i could go and eat a few packs of crisps or go to the chippy, but then i thought about it and thought no, i am just getting a little bit fed up i will give myself the day tomorrow where i wont have any slim fast shakes, but i will keep within the same calorie range as normal, same portion sizes, and i will chose low fat things to eat rather than binge on junk. So today for breakfast i had 2 light choices sausages, 2 healthy living bacon, and a very small can of beans, 380 cals, i havent been hungry since so havent had any lunch, then for dinner i have made 2 beef burgers from the weight watchers website, and i will be having some light choices chips with them 600 cals.
xxx