The calories in a Thanksgiving meal … While everyone is different, many Americans will be consuming several days’ worth of calories on Thanksgiving. Between the turkey, the side dishes, the beverages and the desserts, a typical holiday dinner alone has 3,150 calories – and then people keep eating and can nibble through another 1,500 calories after the big meal. That means you could be going to bed on Thanksgiving night with more than 4,500 calories in your belly. (Fox)