When you force yourself to eat what you think you should instead of what you like you will quit and go back to your old eating habits. Don't DENY yourself - you want a healthier eating plan that you can live with. When I go to parties, family gatherings, weddings, etc. I eat a couple spoonfuls of everything I want. I also make sure I eat a small breakfast before going, along with about half of my water for the day - this keeps you from overeating.
Every little bit helps.
I do this 3 times a week and on the other days I bowl or do other activities. If you cannot get out of the house try marching in front of your favorite TV program. Please don't underestimate the power of group support. I would be lost without it. If you don't care for your leader go to another meeting and keep going until you find one that you are comfortable with.