I can report that chocolate mousse adds 1lb overnight.
But I'm still 2.4lb down this week, which is completely fantastic, and a much faster rate of loss than I am used to. It must be all the encouragement on these threads!
Or more likely, the fact that I've been reading all the advice to others and 1. finally stopped stubbornly adding balsamic vinegar to my salad dressing and 2. exchanged some of my teas-with-milk for peppermint tea.
If you've lost 1lb or 2lb or 0.8lb please don't be downhearted, that is REALLY GREAT - you don't necessarily need to alter anything you're doing. Onwards and downwards!
Calamity and Mlig hope you can find the faith to keep going, I think it will work. Post your menus if you'd like? There are odd factors at work, as Chipping's post said, sometimes the whoosh happens days after the good eating that caused the fat-burning, its when the body is reassured that its not a famine (ie the fat-eating and calories stay high) that it releases the temporary water in the cells.
To quote Ruprekt: Fat and water, Fat and water