Earlier quoted context omitted.
Humans have evolved to process fructose into triglycerides in the liver. This is different than getting a glucose spike in the bloodstream. From what I've heard, what happens to your liver when you process fructose isn't so great for you. It taxes your liver in many of the same way alcohol processing taxes your liver.
Do you have a source for this? Genuinely interested in this linkage, as I'm supposed to be taking it easy on my liver after recovering from a bout of antibiotic-induced jaundice, and apples are one of the things I've been relying on to help with nausea. Thanks!
http://ajcn.nutrition.org/content/86/4/895.full
Also, here is the relevant Wikipedia article: https://en.wikipedia.org/wiki/Fructolysis
Seems like the choice is between more work for the liver or more insulin tolerance.