(By the way, I've just always preferred the NEFA acronym because in my head it sounds out more nicely than "ef ef ay" -- and for whatever reason, I sound it out "knee fah", though a reader once wondered about "neh fay". I don't know there's a correct pronunciation for acronyms like this!)
On a hypothetical Metabolic SAT test NEFA are to lipids what glucose is to carbohydrates and amino acids are to proteins. These are the forms of the three macronutrient classes that are absorbed/transported into and out of cells and circulation and the forms that enter into the energy-producing pathways. By contrast, lipids are stored as triglycerides (aka triacyl glycerols, TAG), while carbs are stored in rather more limited quantities as glycogen, and there exists essentially no true storage depot for protein in excess of "tissue maintenance" needs.
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