http://well.blogs.nytimes.com/2015/...at-fat-or-carbs

(Sorry, traveling with mobile and cannot copy ithe whole article now. It is not a long blog post by Gretchen Reynolds, quotes from Jeff Volek)

The last line implies that the author didn't learn a thing from the interviews: "But for the rest of us, a balanced diet, with less sugar and perhaps a few more pats of butter, should improve our health and in that way allow us to perform better on the trails and at the gym."

You either have to be a carb mini-meal-eater who is constantly topping up your glycogen levels OR a fat-adapted vLCvHF eater for sustainable energy. If you follow a "balanced" diet, your body will first use up all your glycogen so you hit the wall and then try to get your fat-burners started. If you are fat adapted, you burn fat from the start and don't hit the wall or have to stop to eat some carbs to keep going.

sorry wrong comment, please ignore this.

I think for anybody already adapted to burning ketones from a HFLC diet, they will have longer endurance cuz theres no glucose storage issues

My experience, and I ain't no athlete, but I have biked for 3 and 2 weeks continuously a few times on LC, 100 miles tops (with loaded bike) per day. I have no trouble on HF, but the occasional Carb mistake/treat (ice cream) doesn't mess me up. Can it be I just burn those carbs up first? then switch back as I'm already ketone adapted?

And BTW, it is hard to get 80% of your diet calories from fat.