Keep a food journal. You're serious about this, right? So grab a notebook or download an app (there are dozens of free ones out there). When you come face-to-face with what you're eating, it's a lot easier to see where your downfalls are. And to see your progress! And lots of apps have neat things you can mess around with that are pretty motivating, too.
Here's something else most people probably don't know: Fidgeting is good for you. It's considered a nonexercise physical activity, and it's an important way to burn energy. You get more health benefits if, in addition to exercising, you are a more fidgety, more active person the rest of the day. This means gesturing while you're talking, tapping your foot, just moving around.