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I am on a ketogenic diet and it is brilliant lost 2 and half stone in 3 months fitter than when in my early 20s I am 45 now lost all problems with joint and back ache . It is possible to go for longer periods of time without food . Also I enjoy seeing the look on people's faces when I tell them what I eat and that I have a 30 inch waist pre diet 36 inch.
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They improve fat metabolism at the expense of carbohydrate metabolism and according to most studies I've read, basically, you go slower. Not sure if much has been studied in ultra terms though so there might be benefits but it's a pretty extreme option.
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More research coming soon..
http://www.runnersworld.com/sweat-science/adapting-to-burn-fat-as-fuel
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!