It has 18000 results just for weight loss, and if you look at different diets for weight loss, they are conflicting, so I wouldn't trust it.<p>I think PubMed is still the best thing we've got: read medical publications directly, even those are not clear, but at least closer to the data source.
PubMed Health (<a href="https://www.ncbi.nlm.nih.gov/pubmedhealth/" rel="nofollow">https://www.ncbi.nlm.nih.gov/pubmedhealth/</a>), MEDLINE Plus (<a href="https://medlineplus.gov/" rel="nofollow">https://medlineplus.gov/</a>), UpToDate Basics (<a href="https://www.uptodate.com/contents/table-of-contents/patient-information" rel="nofollow">https://www.uptodate.com/contents/table-of-contents/patient-...</a>) all better than WebMD. I am a medical librarian.
According to this study[0] on the diagnostic (and triage) accuracy of online symptom checkers (including WebMD among others), the reliability is a coin toss.<p>[0] <a href="http://www.bmj.com/content/351/bmj.h3480/" rel="nofollow">http://www.bmj.com/content/351/bmj.h3480/</a>