Coconut oil (Lauric Acid) -- This medium chain FA (12 carbon atoms) is found in coconut and mother's milk.
This misunderstood and magical stuff should be in a class all its own because even though it is a saturated fat, it doesn't act like one. This is because being only twelve atoms long it can be easily broken down by saliva and stomach acid without needing your, sometimes scarce, enzymes.
That is why it is in mother's milk because an infants desaturase enzyme system doesn't work very well, making long chain FAs hard to digest. Medium chain FAs do not need to be bundled into lipoproteins and deposited into the blood stream for further processing!
Consequently, it can't make you fat or stick to your arteries because it never enters the bloodstream! Instead it goes straight to the liver and is able to zip quickly through the mitochoandria membrane, to provide INSTANT energy!
The long chain FAs take a long time to break down because they require enzymes that may have already been used up, so the fat becomes FAT... and not ENERGY. Medium chain FAs or medium chain triglycerides (MCT) can help you lose weight through thermo-genesis. An analogy can be made with a wood fire. Long chain FAs are like throwing wet logs on the fire, but medium chain FAs are more like throwing on gas soaked newspapers.
Consequently, you not only get a big burst of energy, but the aforementioned wet-logs (long chain FAs) are also consumed by the fire and heat. So, all things being equal -- YOU LOSE WEIGHT!!!!!!!!!!!
Medium chain FAs also improve the Omega 6 prostaglandin pathway, causing Omega 6 to accumulate in the tissue where it belongs even when levels of EFA are low.