On one of many may forays into the world of commercial dieting (ie Jenny someone) I was told that if you eat at a restaurant ask for a to go box right away and take half the food off the plate before you start eating. If it's not on your plate you won't be tempted. I did that at a business hotel dinner yesterday sans the box. I cut everything in half and pushed it away from the portion I was going to eat and then I did leave it. I took and cut the cheesecake about 1" from the back end and ate only the single inch.
I didn't feel deprived at all. The movement on the scale seems extra rewarding or maybe I've finally gotten into things.