it does make a difference, yes. i usually find i weigh myself early before ive drunk anything as this can add water weight definately..i used to get weighed (last year) at lunchtime after id drunk 2 ltrs of water and my weight loss, when i changed to just after 9 a.m. when theyd opened and i hadnt had anything yet, made a huge difference, which for me, helped me see the weight coming off faster (even if it was only a few pounds and it was water as well)!
hope i didnt ramble too much there and it makes sense!
h xx