I'm not going to criticize your all-chocolate diet, but its always sensible to take supplements in the form of embedded nuts, nougat, praline and perhaps fruit and mint flavoured confections.
I think the most charitable reading of their comment would be something like "replace other fats you use (butter, olive oil, etc) with coconut oil for two weeks".
Edit: you added your edit while I was writing my comment :)
>Coconut oil is the least fattening of all the oils. Pig farmers tried to use it to fatten their animals, but when it was added to the animal feed, coconut oil made the pigs lean [See Encycl. Brit. Book of the Year, 1946].
IIRC, that was more from the fact that coconut oil has zero linolenic acid, which is an essential metabolite. Coconut oil is still a huge calorie source for livestock, just that it's also mixed with soybean oil.
Basically, any combination of coconut oil in your diet that isn't 100% coconut oil will lead to calorie gain.
I would hope that there would be a better source than a 75 year old "summary of news book". If this is true there would surely be more recent and thorough scientific studies.
You'll feel a difference because coconut has a high amount of MCT (medium chain triglycerides). MCT is often touted as a weightloss tool, I've seen plenty of posts talking about pigs not getting fat on MCT, or how it takes more calories to break it apart (which is bullshit) or it some how raises your body temp/metabolism.
The truth is that our stomach has a hard time digesting a sudden influx of MCT. Adding a large amount of MCT to a diet previously free of MCT will cause nausea. And that short term nausea is largely the cause of any "weightloss" seen by MCT. The studies that study MCT and show weightloss are all short term studies, and not the 6-12 month study you really need for weightloss.
In short, you'll feel a difference because coconut oil upsets your stomach. Not because it's a non-animal fat. Hell, we use sesame, peanut, canola, and olive oils all the time. Replace all your dietary fat with canola oil or olive oil and you'll not notice. Will probably have health benefits because of the reduction in saturated fats.
