re. fatty acid oxidation, it produces more ATP but it's a hell of lot slower than burning glycogen. i believe that some peole can do endurance exercise if they're properly keto-adapted, but to pretend that it will work for everyone, or that it's optimal, is lunacy. don't believe me - try it out. maybe it works for you, but if it doesn't... you're in the majority.
"dean ornish and dr. davis think the palmitic acid our bodies use for fuel while we sleep is poison if we eat it. zero-carbers like charles washington think the oldest fuel in our evolutionary history – glucose - used by organisms a billion years ago and without which the brains of modern mammals cannot survive for more than a few minutes – is an unnatural toxin if you eat it. both views ignore basic facts of medical physiology and defy evolutionary history." - kurt harris