It wouldn't surprise me to find out that the average person really does underestimate calorie consumption by that much. Beverages alone are one of the major so

It wouldn't surprise me to find out that the average person really does underestimate calorie consumption by that much. Beverages alone are one of the major sources underestimated calories. A 20oz bottle of soda with sugar is multiple servings, but people don't think about it as such. The same goes for fruit juice and a lot of the fancy coffee beverages. Alcohol is also easy to underestimate, especially if a glass of wine with dinner can turn into half a bottle or more, or a nightcap turns into a double.