The good news is there are things you can do to minimize the effects. For starters, get up in the morning and eat a healthy breakfast. Then an hour or so later fit in some exercise. There are many local Turkey Trots you can sign up for that include both a walk and run. You can make it a family affair and take everyone with you. Some families even hold a flag football tournament that morning. Do whatever it takes to get moving.
If you are cooking the meal, there are things you can do to make it more healthy. Use a fat free chicken broth to make the gravy and baste your turkey. Plain yogurt can be substituted for cream in mashed potatoes, and stevia can be used instead of sugar in baked goods. If you have picky eaters you can stick with your tried and true recipes, but maybe cut down on the amount of butter, sugar, and salt that you are using.
The real test begins when the meal is served. Our eyes tend to be bigger than our stomachs and you may want to try every single option. Please don't. Instead, survey the food and decide what is most appealing. If there's something that you can eat any day of the year then skip it. Instead go for the holiday specialties like stuffing, turkey, and cranberry sauce. Choose portions sizes that are normal for you and eat your food slowly. Savor the moment.
After the meal spend some quality time with your loved ones. My family likes to play board games and tease each other. We have even been known to go for a walk in the neighborhood to further digest the meal. Remember that this holiday is all about giving thanks for our lives and the people in them. I hope you have a blessed and healthy holiday!!