and keeping it off, is utilizing a food diary.
Research has shown that people who lose significant amounts of weight and keep it off for years (or indefinitely...I like to put myself in that category) are the ones who kept a food diary.
A food diary can be as simple as logging what you eat and the approximate or actual amounts of every single bite of food you put in your mouth in a little notebook or even in a word document on your computer. Or it can be as involved as an Excel spreadsheet.
Or you could use an online meal plan/food diary service such as mine. You can see my online personal training and weight management plans page here.
I prefer simple but you should choose whichever method that works best for you.
If you are serious about losing weight then you either need to follow a weight loss plan to the tee or you must follow one, making food substitutions where you want (i.e. chicken for pork, spinach for celery)and keeping track of it in some way. Most people do really well with the latter method.
Here is a good article about the science behind keeping a food journal.
And when you're ready to start on your weight loss journey, I'm here to help!