As was decided in this meta post, answers on Health.SE must be backed up with verifiable references, sources or evidence.
Because this is different in comparison to many other stack-exchange sites, some new members and, strangely enough, even old members seem to have trouble remembering this.
An example of such an answer is the following:
Brain injury is caused by drinking too much water, which can be quite lethal. Many people have died although they drank 2l of water daily. (1)
It is quite tiring to always type the same comment over and over again. Just as we have a shortcut for
[tour], could we also have a shortcut for
[sources]. I could imagine that this looks like the following:
Welcome to Health.SE. Since health is an important topic, the site has a strict policy that all answers should be backed up with reliable references, in order to provide the community with the means to assess the merit of the answer, regardless of the reader's background. See this list of reliable sources. If you still have trouble with this, feel free to visit the help center.
(1): This is obviously stupid and just made up, so that you can get the impression of what answers we are talking about. Note that they may actually be correct but are just not backed up with evidence etc.