In order to lose weight, try to eat less fried foods. The oil necessary to make fried foods is difficult for the body to process properly and it will, inevitably, make your heart and other organs less efficient. Try to mix up eating fried foods with eating steamed or baked foods.
Never go to a party hungry, even if dinner is included. If you eat a light snack with lots of fiber and a little protein and fat half an hour before, you will not be so hungry and the food won't be quite so tempting. Feel free to try a little bit of everything, but only a little at a time so you can enjoy it without regret.