courts? airlines? how about movie theaters? would you want a calorie count for saturday date night at the movies? dave zinczenko is the editor in chief of "men's health" magazine and the author of the wildly popular "eat this, not that" series of books. >> it's a total game changer. to me, it's not about regulation. it's about education. it's a terrific tool for people to use, if they want to, in order to figure out what they're eating. because most of the time, we go to the movies, for example, and we're absolutely shocked to discover that there are foods out there that have a day's worth of calories, fat, sugar, and salt. >> reporter: take that tub of popcorn. they call it a tub for a reason. >> it could be up to 1,400, 1,500 calories. you combine that with a snack and a soda, you might be up to 2,800 calories, john, just going to the movies. >> a dude like me, how many calories should i be eating a