I've been doing this for the last 5 weeks or so on the advice of my naturopath. I always start the day with a big glass of lemon juice and water, followed by porridge. Fruit and yoghurt mid morning, sandwich or soup for lunch, crackers and dip for an afternoon snack and then dinner. It has made a huge difference with regards to night time snacking and cravings. I'm rarely hungry, and usually when I am it's because I'm late with one of my snacks. She told me the trick is always to have a carb and protein with each meal. It helps to sustain blood sugar levels and stops the cravings. I have lost about 4kgs so far without really trying. I don't feel like I am on a diet, just making a few small changes here and there. I haven't been depriving myself if I really do have the urge for something a bit naughty, and it seems to be working.
My problem was that I never snacked. Working full time, I would eat at 7am and then lunch at 1.30, followed by dinner at 7pm (apart from changing cereal, all of these meals are generally the same). So, my problem wasn't bad snacking, it was no snacking. I actually feel like I am eating more, but I would say it has definitely helped my metabolism and significantly reduced my sugar cravings.