Tip - Log your food.
This was something I didn't pick up until a week or two into my journey, it made all the difference. Early on, I had no idea what a portion was, how many calories were in it or what (if anything) my body might be getting out of it nutritionally. Keeping a journal which counted my calories, fat, fiber, protein and basic vitamins for me, let me concentrate on the whole picture instead of carrying a book around.
I kept mine online - for FREE - at leancuisine.com. The link is to the right here on my blog. It was a great easy choice because then I was also eating a lot of Lean Cuisine - simple portion control.
On the site you go under the tools section and you will be able to set-up a profile, keep track of your weight, BMI and indeed, food.
It really woke me up to how quickly I ate up my calories in a day and allowed me to plan ahead. In fact, they even have an option to plan meals for you based on a specific type of diet or calorie count you are seeking. I did try that briefly, but it was not for me. The low calorie ones did not account for fat and I wanted to be conscious of both. (Even though, I know, a calorie is a calorie.)
So try it, set-up a 'flog' - yea, I coined that - short for 'food log'. It will never catch on... but then again, blog did. ;)
Yours in health, Kate