Well, it's really strange, and there are a couple of things I've changed (after 5 years of the exactly same eating habits!), but I've noticed my jeans are much looser today!
Firstly I am eating 3 meals a day with snacks (where as I only ever ate 2 - a big breakfast and a big main meal about 4pm)
Secondly I have cut down of fruit, and eaten loads of oats - and I mean LOADS because I love them! This replaces the All-bran I've been eating since the year dot.
Thirdly I'm drinking lots of green tea.
So, it's weird - I'm probably eating loads more calories than I was ever eating. Another mystery!