Can't outrun a bad diet. Just taking a whole month tracking with My Fitness Pal will open you eyes to a lot of the empty calories you are consuming. For instance I eat a lot of salad. But you can easily turn a healthy 300-400 calorie salad into 800-900 calories. Lean protein, lots of greens and veggies, and a low calorie salad dressing and you can have a super filling 300-400 calorie meal. Drown the salad in a calorie dense dressing and a big helping of cheese and you've easily added 200-300 calories that won't do much to make you feel full. Use two dipping cups of Polynesian sauce with your chic fila? You've added 220 calories to your meal just like that. Big dollop of mayo on your sandwich?
100+ calories. That 100 calories can be used more efficiently somewhere else as a snack to keep you from feeling hungry later. My fitness Pal will open you eyes to all the little things you add to you meal that can really inflate the calories.

For me my lifestyle change was skipping breakfast. No calories until noon. I realized if I ate breakfast I would get hungry at noon. If I skipped breakfast I could be hungry at the beginning of the morning then it goes away once I start working and I get hungry again at noon. Black coffee is all I take before lunch now. Sometimes if I'm really busy I won't get hungry until well past 1.

Next part of my lifestyle change was to eat as few calories as possible during the middle of the day. I can make a big salad or low calorie high fiber wrap for about 300 calories. After that I tend to "graze" on light ~100 calories snacks until dinner. Small handfull of nuts. A yogurt (Oikos Triple Zero are my favorites). Protein bar (sort of like a desert/snack for the sweet tooth, 90 calorie Protein One or the Pure Protein bars when they are BOGO at Publix). Usually I can make it to dinner with about 800-1000 calories remaining in my budget. You can eat a damned fine meal for that many calories so I never have to subject my family to "diet" meals. I can pretty much eat anything with portion control with that many calories. So it never feels like I'm really "dieting" because I eat whatever at dinner. If I need to lose a few pounds I will be mindful of portions and calories at dinner. But I can eat 1200-1400 calories at dinner and maintain my weight since I kept it low cal most of the day.