If this headline is true, you should only hang out with Maria Shriver & The Olsen Twins.   You won't catch it from them.  You might catch "Bad Kennedy luck"  from Maria or an unnatural attraction to Bob Sagget from the Olsens.  But you won't catch fat.  

This only makes sense.  Being around friends that eat unhealthy food, on a regular basis, makes you more likely to indulge in that bad food too.  But the same could be said for a lot of different activiteis.

Think about smokers.  A smoker knows that being around other smokers just makes them smoker even more.   Same thing with food evidently.

Check out the article.  Here's a link.

http://www.dailymail.co.uk/health/article-1384864/If-youve-got-fat-friends-youre-likely-overweight.html