Be Careful What You Watch.
Researchers digitally removed the names of fast food chains from their commercials, showed them to young people ages 15-23, and asked them to identify which restaurant chain each commercial represented. Even after controlling for the total amount of time spent watching TV, young people whom correctly identified more than 50% of the restaurants were twice as likely to be obese compared to those whom did not.
American Academy of Pediatrics, April 2012