The assertion that somehow fatty acid oxidation for energy is preferable to glycolysis is one of the latest gimmicks out there as folks following these generally opportunistic gurus increase their fat consumption and reduce protein consumption in search of some "Holy Grail" of metabolism ... or nutritional ketotic nirvana ... to be a fat burning beast ... burn low and slow or fast and furious depending on which guru you follow. Is it true? I'd say the jury is out and there's at least as much evidence out there to support a glucose dominated metabolism, or better yet, IMO, the notion of agnostic mitochondria so long as they are well nourished but not over nourished.