Advertising affects children's health in several ways. Food advertising that targets children links to increased obesity, as children who watch more than 3 hours of television per day are 50% more likely to become obese. Ads make up 50% of advertising time during children's television shows, and frequently use bright colors, popular characters, and celebrities to grab children's attention and promote unhealthy foods. The techniques of vivid advertising and repeated exposure strengthen children's preferences for these foods and can impact their health.