A recent report indicated that the consumption of fast food among teenagers has doubled in the past five years. In response, health officials argue that this increase will lead to significant long-term health issues, including obesity and diabetes. They propose implementing strict regulations on fast food advertising targeted at young audiences. However, some critics argue that the health officials are overestimating the impact of advertising, claiming that teenagers already make most of their own food choices independently.
Which of the following, if true, would most strongly strengthen the health officials' argument?