I can remember in the early 90's when the book came out, MCT oil was a big seller. Never tried it, so I can't comment on that.
MCTs are the primary fat in coconut oil. It's saturated, yet people in the tropics who consume coconuts have a low incidence of heart disease. This is true in spite of the fact that in some places in the South Pacific, coconuts provide up to 40% of the calories of a traditional diet.
Oddly enough, the people there who have adopted the typical western diet suffer from astronomical rates of obesity, diabetes and heart disease. Much like American Indians in the Southwest.
I ordered some info from Parillo once, but I wasn't able to stick to his diet - I like fruit too much ;-)