Plan a menu of course, and make sure you don't have extra food in the house.
The most important way to limit overeating though, is to mimic what happens during the week. You are busy M-F, with work, chores, and errands, so you don't have time to think of food.
So do the same on Saturday, and Sunday. Fill up the weekend with stuff to do. Exercise outdoors, go for walks, get a hobby, and get out of the house. If you aren't sitting around with nothing to do, within walking distance of food, you will resist the urge to cook up extra food, just as you do the other 5 days a week.
Russell - current BMI 28.6
197 - bmi 30 - done
164 - bmi-25
| current weight: 183.4