Here's what I posted on another thread, at the beginning of August, in response to a similar situation...
"I just dropped about 15 pounds, (see my newer photos just added in my profile, black Levis) for my high school reunion on July 31st, eating fish and vegetables. My trainer has been bulking me up the normal way for over a year, then about a month ago, she, yes, SHE (a former competitive body builder, now trainer/nutritionist), had me begin to increase my water intake, now up to 2 1/2 gallons a day. Also eating certain vegetables that are diuretic in nature, asparagus, broccoli, spinach (but that is high in sodium, so watch that one...), green beans. Increasing your intake of those to 1-2 cups, cooked, at every meal. Eat every 2 hours, small portions, measured cooked, since obviously you will eat again in 2 hours. I love fish, so I was able to rotate different dishes, so as not to burn out on it. 6 oz portions at a meal. No salt, herbs, like Mrs Dash brands, are good. No rice, or potatoes (your cutting carbs/starches), or very small portions, BEFORE early afternoon. No sugar. No fruit (it's sugar, even natural). No sodas. WATER only. If need be, take a diuretic pill, but keep the water coming. Expel, or Extract, are 2 of the diuretics I know of...
Needless to say, at my reunion on the evening of July 31st, my 30th high school reunion, gay or not, I was the center of attention, mobbed for photos by the women, and pumped for information about my workouts by all the guys... even the fat ones that were the sports gods I had crushes on in high school.
Good luck on your weight loss!"
...Now, Redbull, this was all to diet down and get more vascular for my reunion, so it may be more extreme than you are looking for. But essentially, cut your sodium down, drink much more water, eat more veggies, as I mentioned above: asparagus, broccoli, green beans, etc.
Surprisingly, most people do not know that sodium is a big part of the problem in weight/water gain.
And eating carbs late in the day, the body takes longer to break those down, and stores it overnight as fat, if eaten too late.
Try some of what I wrote out, it may just help....
Sincerely, Todd (fitartistsf)