I've cut out fizzy drinks completely (diet or otherwise) apart from weekends. Also no crisps or chocolate in the week too. It's boring and I'm feeling hungry a lot of the time but it worked for me last week and I'm still motivated enough to carry it on until I go on holiday.
Now, I don't know what your diet's like and i'm sure you've probably heard this before, but on the assumption that like the majority you're sticking to the 'three square meals a day' rule, have you considered reviewing that?
I used to be the same (although I often avoided breakfast and ate at god forsaken times) and one of my main problems was always that because of the big gaps between meals I was always hungry (like you), so what did I do? Snack. But when I get to the point where i'm really hungry I don't think about what i'm eating, I crave shit, so out comes the chocolate or the pack of chocolate digestives or the Ginsters slice. Failing that i'll ramp up the portion size on the next meal because i'm starving by that point.
Anyway, after researching a bit about eating habits and weight loss and all the rest of it I constructed my own diet plan based around eating 5-7 (smaller) meals a day (or every 2-3 hours), rather than 3 larger sized meals. First off it meant that I was never hungry so I didn't have that urge to splurge on the usual shite that you regret afterwards and secondly, it's much, much better for your metabolism, keeping it working throughout the day.
The other thing is to make sure you drink plenty. Half the time you think you're hungry you're in fact thirsty. I have a pint of water at my desk throughout the day - and usually a bottle in the car if i'm driving.
I appreciate I may have been telling you how to suck eggs there, but in case you haven't considered it, it's worth knowing at least.
