"We're losing a ritual. We're losing a ritual that I believe is transformative, transcendent, and is at the heart of the patient-physician relationship."

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If your friends are obese, your risk of obesity is 45 percent higher. ... If your friend's friends are obese, your risk of obesity is 25 percent higher. ... If your friend's friend's friend, someone you probably don't even know, is obese, your risk of obesity is 10 percent higher. It's only when you get to your friend's friend's friend's friends that there's no longer a relationship between that person's body size and your own body size.

— Nicholas A. Christakis