:What's your point?  Yes fatty acids can also be directly utilized aerobically but, barring execize, within a few hours of a high carb mean, insulin has the body in the substrate storing "fed" state.  When in the fasting state, the energy that the liver uses for gluconeogenes is is supplied by fatty acids in the liver, to use glucose would be a futile cycle.   Atkins is just around in a different form, marketed a little better and called "South Beach".  I didn't put the fad stuff in the article, it is not a precise term anyway.