Eat until I'm full instead of until I'm stuffed.
... or eat until I've have enough instead of until I'm full.
Taking a salad for lunch one or two times a week, instead of a sandwich (cold cuts), and adding lettuce to my sandwiches and less of the other stuff.
(I've cut out ham, salami and pepperoni, but I'm still taking either turkey or roast beef.)
The in-between meal snacks are mostly gone. I haven't bought that extra 25-cent bag of chips on the way out of the grocery store. I'm leaving the cookies for the wife and kids. I've been taking a banana most likely.
Cutting out those dollar-menu items and the .99-cent whopper nights when I buy a decaf coffee.
Sometimes it seems simple, and sometimes it's a little like my old pre-calc class: it seems like I keep approaching 200 but I never quite reach that limit. It just seems to take a little more effort to get there.
Those little things make a difference. Someone else mentioned writing everything we eat down and one of the reasons why that works so well, is because we don't realize how many times we may be snacking or nibbling on something. Those seemingly little snacks really add up over the course of a day and week.