Don't let your food touch! When filling your plate for a meal, think in terms of having only one plate, no seconds! Also, don't let your food touch. Keep the mashed potatoes in one pile, the pork chop in another and the broccoli in another. That way you are much more likely to not overeat because, in effect, you are controlling your portion size.
Totally eliminate mayonnaise from your diet because it can pack on a lot of fat and calories to your diet that you really do not need. You can add an additional 200 calories to your sandwich by just adding mayo. There are low calorie alternatives like mustard and horseradish.
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Instead of trying to chose a number for a weight loss goal, try using a different type of measurement. Have a pair of pants that you love but don't fit? Make your goal to fit into those pants. This will take your attention away from the scale, which is not always an accurate measurement of weight loss.
You should try to make it your goal to lose at least one pound each week. If you are not losing this you should try to make an adjustment to reach this goal. One pound each week ensures that you are slowly losing weight at a healthy rate.