Ok, back...what did I miss? Nevermind.
GeorgeB, with respect to 65'ers wife's diet: To be ketogenic, you restrict carbs (25-50g/day), but you also restrict protein (50-100g/day). Because of glycogenesis, excess protein will be converted to glucose and your body will burn that instead of creating ketone bodies from stored fat. So at the end of the day, you end up somewhere near 80% of your diet as fat.
It's also worth noting, that when you add fat to coffee or tea, the fat somehow (not sure about the mechanism) affects the transport of the caffeine. It seems to be a little stronger, but also longer released. I don't know if caffeine is fat soluable or there's something else going on, but there is definitely an effect. Maybe that's why people started putting cream in their coffee in the first place.