Check out the amount of calories there are in a serving of the average Thanksgiving dish:
All of this comes to a total of 2,335 calories, which doesn't seem that decadent when you consider the average person consumes about 2,000 calories a day, but that's if you stick to the exact serving sizes. Most people are eating double and triple servings of their favorite sides. And when has Thanksgiving dessert not included various pies and sweets? Who only eats one piece of pumpkin pie?!
When you are sitting down to dinner, you have two choices – embrace the bloat and unbutton your pants for an eating bonanza, or, be conscious of serving sizes and skip sides that you can live without. (CollegeCandy)