[livi]

Its a standard joke among collegues. When ever we have a kid where we are not able to find anything somatically wrong but the parents are not satisfies (a rather large group) we always analyse Vit D. We know the values are below the reference level in a large majority so now we can tell the parents we have found the problem. Recommending substitute and relying on a combination of natural course of wellness and placebo. Its a life saver for a pediatrician.
On a serious note, there are individuals with low levels of Vit D that does have health implications but those are far between in a pediatric setting. At least among caucasians.