Part of the effort to curb child obesity in the US has been to rethink vending machines – in particular, those offering sugary drinks at schools. The theory is that students make healthier choices when they have healthier options in front of them.

And new research from Dartmouth College shows the contents of those machines are changing – less sugar, more bottled water. But not every school is changing in the same way.

Click here to listen to Dr. Anna Adachi-Mejia of Dartmouth College as she talks 's talks with NHPR's Brady Carlson.

Dr. Anna Adachi-Mejia led the study of high schools in New Hampshire and Vermont, which was recently published in the journal Public Health. She joins All Things Considered host Brady Carlson with more.

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