The San Jose Mercury News reports that food manufacturers are turning to “advergames” to sell products to children. Because childhood obesity is a national concern, health advocates have long decried the use of television advertising to sell unhealthy foods to children. While TV still commands the bulk of junk food advertising, the internet is seeing an increased role. A study by a nonprofit health care policy group found that 75 percent of the 77 product web sites analyzed had some sort of “advergame” target to children on them. These games allow children to play endlessly in a name-brand environment, rather than passively staring at a 30 second TV spot. In addition, a quarter of these websites enabled kids to sign up for special offers and upcoming commercials–only half of these sites required parental permission…