That's why they suggest MCT oil instead of coconut oil, as coconut oil only contains a percentage of MCT.
As for reasoning, it is well explained in the article about the stuff and the reviews. Have not tried it myself, so have no idea if it works.
So consuming 300 calories from another source will have the same effect as using the formula for the coffee, especially on an empty stomach?? So may be 300 calories from sugar will have the same affect on the body as 300 calories from good fats??
I am guessing 300 calories from sugar will take you straight out of Ketosis, spike the crap out of your insulin for a short energy boost and then give you food cravings for the rest of the day. While the 300 calories of fat will promote Ketosis, which will promote fat burning, which will suppress cravings and hunger, coffee will boost the metabolism and make you more alert and also suppresses hunger cravings.
I seem to remember alan aragon showing plenty of research the effectiveness of MCTs is pretty flimsy at best anyway.
Sugar taking you out of ketosis, it's assuming you are in ketosis anyway and want to be. Why?
Insulin doesn't give you an energy boost.
Your blood sugar levels should remain reasonably constant unless you are a diabetic. If you get massive blood sugar highs go to a doctor.
Eating fat doesn't promote ketosis, lack of carbs does. Again you are assuming ketosis is a positive or needed to lose fat. Why.
Calorie for calorie many carb foods are shown to be better at suppressing hunger than fats.
You are right caffeine is decent at suppressing hunger.