A study found that Google's AI Overviews cite YouTube more than any medical website when answering health-related queries, with YouTube making up 4.43% of all AI Overview citations. The researchers analyzed over 50,000 healthcare-related prompts and keywords, and the results raised concerns about the reliability of AI Overviews for health information. Google responded that AI Overviews are designed to surface high-quality content from reputable sources, regardless of format. The study's findings have sparked debate about the potential risks of relying on AI Overviews for health information.