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That's about 49 million people, or 14.6 percent of U.S. households. The numbers are a significant increase from 2007, when 11.1 percent of U.S. households suffered from what USDA classifies as "food insecurity" — not having enough food for an active, healthy lifestyle.

Researchers blamed the increase in hunger on a lack of money and other resources.

President Barack Obama called the USDA's findings "unsettling." He noted that other indicators of hunger have gone up, such as the number of food stamp applications and the use of food banks. And he said his administration is committed to reversing the trend.