What has always helped for me is to plan - plan my food, plan my cardio, plan my strength. Don't just say you're going to do it, write down or enter your food into the nutrition tracker. Schedule your cardio/strength out for the week - track it in the fitness tracker.
I find if I do my food the night before or the morning of and then I just leave it at that. I know what I have scheduled to eat and forget about it then.