This is why I think programs like Weight Watchers or other calorie-counting programs aren't the greatest. I tend to think "Ohhh..I have four points left (or 200 calories)! What else can I eat?" whether I'm actually hungry or not. If the labels aren't correct on products, I may not actually have four points left. We bought some subs for a school fundraiser and on the label the sub was one serving for 350 calories. It looked awfully large to me to have so few calories, especially since it had on it salami, ham, and cheese. A serving size was one sub, __ number of grams (can't remember how many). I got out my food scale and weighed it. That sub was more than 1 1/4 servings according to the weight. If I had been counting calories, I'd have been over by more than a tiny bit.
It makes so, so much more sense to me to simply eat when I'm hungry and stop when I'm full. Most of my choices are healthy ones and I don't have to be afraid of holiday meals -- or any meals.