More rigour in applying the stack exchange standards of questions and answers on this site.
Personally i have an interest in this topic but when I first looked at this site some time ago I decided that the same problems endemic to online fitness fora existed here:
Under-informed, overly broad questions(yet almost exclusively personal) and opinion based, excessively long answers.
This may seem a little harsh as there's clearly much work being done on a topic where misinformation and false assumptions are the norm, but IMO It's well short of stack exchange standards. Stack Exchange is a harsh place, where rigour is paramount; this is what sets stack overflow etc apart and is what is needed to set this site apart from similar online offerings.
In practice this would require severe editing, closing and duplicate-marking of questions and far greater criticism and editing of answers.