Hannaford Supermarkets' Guiding Stars program, which uses gold stars affixed to shelf price labels, seems to have changed some buying habits, according to a new study. The study focused on the cereal aisle and found that sales of no-star cereals dropped almost 3%, compared with a group of stores without the rating system, while cereals with 1 to 3 stars saw measurable increases of up to 1%. "Although the percentages are small, if you think in terms of actual quantities or boxes of cereal sold in the national market, this could have some important implications on the nation's health," said Jordan Lin, an author of the study.

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