Yep, 5" is huge, and that's definitely not all water weight. Does it fluctuate 5" every month? I highly doubt it! Losing those inches in your waist / abdomen is a GREAT indicator of your diet change. You have lost quite a bit of the deadly visceral fat that pads your organs and wraps around your intestines. The salads and fruit are great carbs and I'm not surprised this is the result from eating those healthful foods.
I imagine you have also gained a bit of muscle since your weight hasn't changed.
If you want to lose weight keep on track with eating those salads and fruits, cut back on your fats (no more than 30% total calories), and eat the proper amounts of lean protein (I'm guessing you'd need a minimum of about 80 g of protein a day). Keep the overall calorie intake low, of course. Losing weight is a slow process, but keep at it and you'll see results.