Step 1 : Introduction to the question "How many calories does the average person consume at a Thanksgiving dinner celebration?"
...When calculating the calorie consumption at an average Thanksgiving dinner in the U.S., pre- and post-dinner nibbling, appetizers and drinks before and after the meal all contribute to the final calorie count. Research from the Calorie Control Council lists a typical Thanksgiving dinner at a whopping 3,000 calories. When you add in the 1,500 additional calories from nibbling and drinks, an average Thanksgiving dinner may pack an incredible 4,500 calories or more. This means a typical holiday dinner of turkey with stuffing and all the trimmings is equal to more than 2 1/4 times most people's average daily calorie intake. Source: CalorieControl.org