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More research coming soon..
http://www.runnersworld.com/sweat-science/adapting-to-burn-fat-as-fuel
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That's interesting. I'm keto adapted, and on this ride (before breakfast, no fuel during) the numbers match up amazingly well: 1.54g of fat per minute over 2H24 would be 1996 kcal, and strava says I burned 1989.
http://app.strava.com/activities/313422443
Such a precise match must be coincidence though, I expect I used some stored carbs.
Out of interest, anyone on here on a Ketogenic diet, or ever tried it?
Several things have got my interest recently. A few talks I've watched online, and then today hearing Billy Rice is doing Tour Divide, twice, on a carb free diet (I'm assuming high fat, adequate protein) He's riding North Bound right now, on his own, then turning around on a tandem with his daughter and riding back south. That's 5400 miles and > 400,000 feet of climbing. He claimed in a call-in from New mexico today to have done 100 miles without extra food, and to be feeling great!