All I can say is Ummmm .... medical research results again.
I would never attempt to get my dietary fibre (soluble or not) from my espressos. I think those researchers have lost the plot or the Diabetes site has been selective in their extraction of paragraphs. But then again what shall I do; try and look up the original scientific paper or go and make myself a shot from MT Bin 478 roasted by nunu. The later wins.
I just feel like being a Skeptic tonight :-)