“You are what you and your friends eat.”
This is according the lead author (emphasis added) of some absolutely fascinating research looking into the social networks of those who are obese — and how the interesting correlations that exist.
Essentially - if your friend becomes obese - there is a high chance that you will also become obese. The closer the friendship, the higher the chance.
The entire study can be seen (free) here. Time magazine also have a good summary (along with a short video displaying the “clustering” affect.
Does Geographic Distance Have an Impact? No.
“…friends who lived a 5-hour drive apart and saw each other infrequently were just as influenced by each other’s weight gains as those who lived close enough to share weekly take-out meals or pick-up basketball games.”