According to a report by the Yale Rudd Center for Food Policy & Obesity, fast food brands spent $4.6 billion on advertising. Kids under age 6 viewed nearly three fast food ads daily on average, and teens between 12 and 17 saw nearly 5. According to Jennifer L. Harris, PhD, director of marketing initiatives at Yale's Rudd Center, in a PsychologyToday.com blog, adolescent brains are particularly susceptible to food advertising messages. Brain scans show that the reward centers of teen minds have a greater response to food advertisements and food logos, including fast food, compared with other types of ads, she wrote. What's more, she continued, "due to heightened reward sensitivity, adolescents are not biologically equipped to forgo these tempting offers in the short-term for greater rewards in the future (such as good health)."