News Summary: McDonald's warns of tough year ahead

BOTTOM LINE: McDonald's Corp. reported a second-quarter profit that was 4 percent higher than a year ago but fell short of Wall Street expectations. Global sales at restaurants open at least a year edged up 1 percent.

LOOKING AHEAD: Based on its recent sales trend, the world's biggest hamburger chain warned that results for the year ahead are expected to "remain challenged."

BACKGROUND: The company, based in Oak Brook, Ill., has been trying to adapt to changing eating habits in the U.S. with items such as chicken wraps and egg-white breakfast sandwiches. Moving forward, it said it had plans to "satisfy evolving customer expectations."