what does the synthesis of fatty acids mean?

In non-ruminant animals , fatty acid sythesis occurs as a result of extramitochondrial acetyl CoA that is carried from the mitochondrion via citrate ( yes the same compound in the Krebs' Cycle ). Under high carboydrate intake with lesser energy demands , the signal for ATP production via TCA linked to ETS is slowed and the citrate is carried OUT of the mitochondrion to be converted to acetyl CoA and then to malonyl CoA. Fatty acids are syhthesized 2 carbons at a time ( thus always an even number ) and this pathway ends with C16 ( palmitic acid ). The chain can be elongated by other processes. Excess calories taken in are stored as fat predominantly because we have a limited capacity to store glycogen and an almost umlimited capacity to store fat...

The synthesis of fatty acids means that sugar molecules are loosing a lot of hydroxyl groups (OH) and turning into long carbon and hydrogen chains that have one carbon double bonded to an Oxygen and an OH, but most of the molecules just a long chain of carbon with hydrogens. It is done by the body to make lipids for either storage or to use as membrane components.

Fatty acid synthesis is effectively the reverse of degradation process.

The final synthesized product is a polymer, and hence obviously the process is initiated with the collecting of monomers together.