When food shoppers bring their own sacks, purchases are both more and less healthy

"Paper or plastic?" A few years ago, grocery shoppers had just two options when deciding how they wanted to carry out their purchases. Today, while most stores still offer free bags, many shoppers bring their own as a way of being "green." Many stores have encouraged the shift to reduce waste and energy consumption, and to recognize the burgeoning movement to ban disposable plastic bags.

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