TODAY | December 30, 2013
>>> it will soon be hard to miss one little known requirement of president obama 's health care law . it's designed to help you make smarter snack food choices. nbc's joe fryer has more.
>>> if the calorie count for the stuff on the other side of the vending machine glass seems like a mystery. just wait. as part of the healthcare overhaul, calorie information will be posted on vending someones. welcoming to some.
>> it's a good idea. there's a lot of things i go to eat that i shouldn't be eating.
>> horrifying to others.
>> when i go to a vending machine i know i'm not doing something healthy and i don't need to be told.
>> reporter: many fast food restaurants already post calorie information while early research shows most customers don't pay attention to those numbers, one study found those who do eat a little less.
>> it doesn't have to be hard science to see that this is a good idea. information is there. you can use it or choose to ignore it.
>> reporter: vending machine companies fear the changes are too costly and won't change many habits.
>> in the vending industry, the best sellers in our machines are the junk food and the high calorie drinks.
>> reporter: the fda estimates the changing will cost vending companies nearly $10 per year per machine. what's harder to predict is how many calories customers might subtract from their diets. nbc news, los angeles .