Mintaka, how did you go about the Feldman protocol? I can think of one way it could be innocently messed up.
During an extended fast cholesterol goes up. Makes sense with the protocol, increased reliance on body fat for energy. Also makes sense from an insulin perspective, higher free fatty acid release from adipose tissue, increased production of VLDL by the liver. All has to do with Feldman's increased fat trafficking stuff.
Okay, now take somebody on a low carb diet. Keep everything the same--have them eat what they're already eating, but add fat. Less energy needs to come from adipose tissue, fat trafficking changes, more reliance on dietary fat. Should get Dave's results.
There's another way to increase fat--you could get more of your calories from fat without increasing calories, or even increase calories but still decrease the proportion of protein and carbohydrate foods, and wind up with lower insulin levels by eating a more ketogenic diet. Which might be fine--it seems to be what works best for me personally both from a maintenance and from an overall non-scale benefits perspective--but decreased insulin might increase release of body fat, increase the sort of fat trafficking you're trying to decrease by eating more fat. I don't know because I've not had it measured, but I suspect my ldl is higher on my current more ketogenic diet than it would be on my previous more traditional Atkins-with-occasional-peanut-binges approach.
I've found Jimmy Moore interesting in this, during his initial one year, measure and report, weigh food, check blood sugar and ketones daily approach where he was losing weight, his ldl cholesterol and particle counts were pretty high. When he started his prolonged fasting for weight gain protocol, everything went down. I think this fits into Dave's idea--the fasting itself would raise cholesterol, but the increased appetite between fasts might look more like Dave's fat overfeeding protocol, and bring the numbers down below where they'd be if Jimmy'd never fasted.
In retrospect, Jimmy's results seem obvious. Take somebody who's eating a weight gain diet--post that year of a ketogenic diet with high accountability, reporting numbers on a regular basis, to himself and the public, Jimmy's ketogenic diet was a weight gain diet. I refuse to call this a failure of the ketogenic diet. The old saw of doing the same things and expecting different results has a corrollary--you shouldn't change a bunch of stuff, call it the same thing, and then say the same thing doesn't work any more.
Fasting and then eating a fattening diet, whether you call it ketogenic or not, is probably not going to work. It's not what Dr. Fung and Megan Ramos report doing--they fast people, and all along, they're also trying to get people onto a less insulinogenic diet than they were eating prior to starting a fasting protocol.