Good sources of health information exist outside of doctors. Lots of governments, health insurance providers, colleges, and so on have good information.
Not to mention pharmacists, nurses, and the like.
And, of course, doctors. Why the heck would you trust an ad for a medical advice over a doctor - or set of doctors - giving you care after having been educated in the medical field well longer than yourself?
There is also a slew of information the general public doesn't really understand. Like why New Shiny Drug X isn't really an improvement for you than Slightly Older Shiny Drug S. Or why the doctor is leaning towards disease X instead of Y even though the symptoms are similar.
And then there is the bottom of the barrel. The outright dangerous stuff. David Avocado Wolf, for instance. The "Clean Eating" bandwagon. Being vegan without proper nutrition information, which is often lacking in the material. Or anti-vaccine movements that claim measles are good for folks, lying to say it prevents cancer. If you are lucky, you'll just wind up with one of the "cures" that aren't cures, but not actually harmful. Airborne for colds, for example, or most homeopathy that actually is. Or you might get mildly unlucky and wind up pregnant for not realizing St John's Wart can interfere with birth control. Or maybe Zicam will cause loss of the sense of smell.
Considering this last bits of information... yeah, I wish folks would only get their information from accredited medical professionals (though this includes more than doctors).