As usual, the devil is in the details. It's impossible to capture all the nuances of each study in those pithy headlines and 10 second sound bites. For instance, there's a huge difference between observational studies and randomized controlled trials. The former help us develop hypotheses while the latter help (dis)prove them. Case in point is a cross-sectional study (published online prior to print next month) of 411 obese kids compared to 87 non-overweight controls, all 6-16yo. Compared to their non-overweight controls, the obese children were more likely to have vitamin D insufficiency and deficiency. Moreover, low vitamin D was associated with greater risk for type 2 diabetes mellitus (T2DM).