A new study suggests that low-calorie foods, including green vegetables and fruit, are becoming more expensive, while calorie-dense foods, such as sweets and snack foods, are becoming more affordable. In a two-year period, the average price of low-calorie foods increased by almost 20%, while the average price for snack foods dropped 2%. These findings might help to explain the prevalence of obesity among low-income Americans, researchers said.

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