Girls tend to have iron deficiency anemia if anything due to social diet habits and menses. The dates are the same at least; it's the 15th, which is when Megumis said to be dead across all mediums. FujiRyuu added the daily fortune part, which I thought was a nice touch that also perhaps made people early on consider it from a mystery angle. Ultimately turned out to be irrelevant, but what's a little red herring?