Something shocking is coming to the McDonald's menu

McDonald's (MCD) new ad campaign highlighting its "Favorites Under 400 Calories" isn't just an attempt by the company to highlight its healthier items during the Olympics; it's probably a preview of what's to come from restaurants around the country.

A provision in the Affordable Care Act will require some restaurants and other food vendors to display calorie information right on the menu. That has some companies, like McDonald's, trying to get ahead of the curve.