In the running community, as with many groups, there is a large mutual sharing of information. The majority of the time, it is based on genuinely good intentions of trying to share what people have found works best or may have been helpful to others. But there has been a few verbal stoushes recently (for example, on the subject of non-coeliac gluten sensitivity) whereby one or more persons subscribe to a particular belief and defend it fanatically, without realising that they don't actually have and good evidence to back it up. A common example is using the opinion of an "expert", which has long been considered by the research community and the lowest level of evidence.
When you look into health related issues (if you ever do), do you have access to or know how to interpret medical research? Do you tend to use news sites or other people's knowledge for info? Or have you been in a similar situation as above?