This was an observation amongst the vast sea of observations for over a year and a half. It still needed to be studied. A year and a half ago, and partly even

This was an observation amongst the vast sea of observations for over a year and a half. It still needed to be studied. A year and a half ago, and partly even now, the kneejerk response has been "ah, it must be because people with low Vitamin D are doing other inactive things with poor diets and low sunlight" as opposed to something closer to "Vitamin D supplements are a cheap existing solution for a reason we still don't know yet"