Obesity is contagious

The ever-wonderful Dr. Tatiana had a great piece about contagious behavior:
...infectious diseases — those, like flu and tuberculosis, that are caused by viruses or bacteria — are not the only aspects of health that can spread from one person to another. Taking up smoking is contagious; so is quitting. Obesity is contagious. So is happiness. At least, these are the results coming in from long-term studies of social networks...
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