The next time youre asked, “Do you want to supersize that?” keep this in mind: Fast-food customers who order bigger meals consume about __500 calories more than they think__, a study finds.

“One of the big dangers of fast-food lunches is that we not only mindlessly overeat, but we mindlessly underestimate how much weve eaten,” says Brian Wansink, lead author of the study and director of Cornell Universitys Food and Brand Lab in Ithaca, N.Y.

[Read](http://www.usatoday.com/news/health/2006-09-04-fast-food_x.htm?csp=34 “Read the Story”) (USA Today)