I can't give any references, just working from memory here. The first study linking coffee consumption to heart disease was performed in one of the Scandanavian countries. They boil their coffee which releases some kind of oil into the coffee. the oil seems to elevate cholesterol.
Another study found if coffee is prepared by the drip method using a paper filter, what little oil is released from the coffee grounds is trapped by the paper. So no adverse effects on health.
A (I believe) third study found coffee has a fair amount of anti-oxidents which promote good health, but the antioxidents dissipate or decompose within 10 minutes of brewing so you have to drink your coffee right up to get the benefits.