McDonald's to Post Calorie Counts on Menus Across U.S.

Industry officials say it is likely other fast food chains could follow industry leader's initiative.
3:00 | 09/13/12

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Transcript for McDonald's to Post Calorie Counts on Menus Across U.S.
We turn, now, to a major headline from the makers of the big mac. McDONALD'S ANNOUNCING PLANS TO Put calorie counts on menus across the country, making them the largest food chain to do so. JIM AVILA IS AT a McDonald's this morning with more on this. Jim, good morning. Reporter: Good morning, amy. You want fries with that? From now on, you'll be able to tell just how much treadmill time it will cost you, right FROM the McDonald's menu. A new day at america's most popular guilty pleasure. McDONALD'S WILL NOW TELL US HOW Much those french fries are costing our waistline. They're being up front about their ingredients and stuff. And I think that's kind of important to have that visibility in what you're eating. Reporter: Rare praise for McDONALD'S FROM THOSE IN THE Nutrition world, traditionally critical of the company. Now impressed by the fast food giant's decision to post calories on its menus. IT'S GREAT that McDonald's is going to let their customers decide for themselves how many calories they want to eat. Reporter: What difference will it make? Experts say seeing those calorie counts could encourage diners to pass on the angus bacon and cheeseburger with its 790 calories, in favor of a McCHICKEN SANDWICH, WITH ONLY 360. Or say no to the double-quarter pounder with cheese, at a whopping 750 calories, in favor of the regular cheeseburger, at 300 calories. Diners will also see the big mac pack 550 calories. But the honey mustard snack wrap carries 250. We're giving the customer infinite choice. Reporter: A choice, say critics, to end the mindset of, I'm here, so I might as well indulge. Is the large fry really worth it? Could you be just as happy with the small fry when you see what the calorie difference is? Reporter: Does it really work? Many studies conclude when it comes to fast food, we pick with our stomachs and our pocketbook. Not our head. As consumers get used to seeing calories on the board, they'll make better choices. WHAT HAPPENS at McDonald's never STAYS at McDonald's. They're an industry leader and

This transcript has been automatically generated and may not be 100% accurate.

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