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You must be bored witless to create a new definition for the word contagious.

It is not really a new definition. Fact is the contagiousness of obesity has pretty much been scientifically demonstrated. I'm sure you are aware of the concept of "memes". The whole theory of memes is based on the assertion that ideas are socially "contagious". That's how fads and brands are created. The cause of obesity is ultimately a set of memes that make it okay to eat too much fattening foods and get less exercise.

Madison Avenue spent millions sending out the memes that "Coke is IT" or that it was the "Pepsi Generation". They made contagious the memes that made soda the drink of choice and potato chips the default snack for all occasions. Our society promotes all sorts of memes that make driving the default over walking and promote a sedentary over an active lifestyle.

Want something more direct? There are several studies providing evidence that obesity is in fact contagious. One is from the New England Journal of Medicine:

Summary: Obesity is socially contagious"

A more recent study comes to the same conclusion: "We Should Consider Obesity as a Kind of Contagious Disease, Study Shows".

This study states that obesity is infectious but requires different modeling than traditional infectious diseases.

There is substantial empirical data showing that if you hang around fat people, you are more likely to become fat. That sounds like something contagious to me.
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