No matter the arguements about proper nomenclature for cinnamon's MOA I will say this - there is no cause for concern that cinnamon will increase adipose accumulation through insulin sensitizing of adipocytes. I say this with authority due to the fact that for almost a month straight now I have been high end dosing cinnamon extract 4% essential oils extract 250mg per pill, which I have been taking upwards of 8 per day.
My caloric intake has decreased over the last 3 weeks, but macro breakdown is high good fats i.e. lots of sardines, salmon, EVOO, Tahini and Natty PB. I am down in weight and as ripped or more than I have ever been.
The jury is still out on any benefit derived from increased muscle cell sensitivity, but I appear to have lost little to no strength in the face of my cut and size is unaffected.
The bottom line is this though, ZERO negative results as far as fat gain, so for those looking for a very inexpensive way to manipulate insulin anabolism don't overlook cinnamon!