What is the significance of the 2007 study by Christakis & Fowler regarding obesity?
The 2007 study highlighted that having an obese friend increases an individual's risk of becoming obese by 57%. This effect extends through three degrees of social separation, emphasizing the power of social norms over shared environments in influencing behavior.
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This is one answer. The complete system — the psychology, the biology, and the method — is in the book.
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