Eat a light, healthy meal before Thanksgiving so you won't be urged to gorge yourself in foods that have an abundance of calories.
Instead of eating everything on the Thanksgiving table, only pick your favorite foods and have them in moderate amounts.
If picking the lesser of two evils, go with Thanksgiving foods high in fat rather than carbohydrates. Your body always burns the fat first but, carbohydrates get churned into stored energy and later become fat.
Drink lots of water as it fills you up and suppresses hunger.
Hit the gym before Thanksgiving as it will turn your body into fat burning furnace and briefly enhance your metabolism.
Instead of watching football on Thanksgiving, actually play with your family. It's a fun way to burn off the calories.