From soda bans to bike lanes: Which 'natural experiments' really reduce obesity?

Many public health researchers take advantage of 'natural experiments' -- comparing people's calorie consumption or physical activity levels, either before and after a policy or environmental change, or in contrast to a similar group of people not affected by that change. But not all natural experiments are created equal. A public health team has now systematically reviewed the state of the science.



from Diet and Weight Loss News -- ScienceDaily http://ift.tt/1FgQGhE

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