Ihere was a study in The Netherlands some years ago, at a reputable research university, on the apparent effects of unfiltered coffee on "bad" cholesteral levels... ultimately narrowed down to cafestol (?), if I remember correctly, which is a component of the oils in roasted coffee which is very much higher in plunger or espresso or percolated (does anybody still do this?) coffee (any unfiltered coffee method).

In concern with caffeine stimulating the adrenals which in turn stimulate a release of glycogen from the liver and THEN a responsive rise insulin, well, it's downhill from there!

I'm thinking it's this combination (and maybe more!) that makes the good Dr. A so darn specific about coffee rather than caffeine...