It's week 4 of the diet, and both I and Jim are probably going to extend it further as it's going so well. I'm in the process of writing an ebook with plenty of recipes and tips on how to follow the diet. If there's one tip I had to give for staying on diets, it would be this: buy your food online.
To ensure that I didn't get sick to death of the food, and that I wasn't constantly nipping to the supermarket, I've had to plan meals for the entire week - shopping online really helps get everything together quickly and easily, and I can look up recipes depending on what was on offer there that week, which also helps with budgeting. Meal planning is a pretty integral part of sticking to any diet - if you fail to do this, you may well end up having to rely on takeaways or grabbing a bite to eat from the local cornershop (which isn't going to stock fresh sandwiches and fruit).
This is the biggest reason I tried not to venture into supermarkets this month; it's all to easy to accidentally wander into the biscuit section, or the bakery, or see the offers on the end of the aisles and just 'accidentally' buying it. It sounds odd. but I manage to get a lot of confectionary without meaning to if I'm not concentrating (damn that sweet tooth!). Without the temptation of BOGOF offers, the smell of freshly-baked croissants and the lure of the chocolate section, keeping healthy is a lot easier.
Cutting out additives, simple carbs and adding in more lean meat, fish and fresh fruit/veg/nuts is surprisingly expensive. Online shopping just helps to keep an eye on the price for the weekly shop without having to put too much effort into it.
Thanks to Phenuncle for the image