Thanks for the response, Lex. I figured you wouldn't be interested, but thought I'd give it a shot, as I'd want you to do the same for me.
I'm not a dietary guru and it was actually an unknown person here, Muhammad Sunshine, who tipped me off about RS, not a guru (or maybe you're aware of his huge popularity somewhere else?
). The important thing for me is that RS has helped, and more so than I expected. Like you, I was quite skeptical of it at first, and expressed that in my comments to Muhammad. I try to stay open-minded and didn't dismiss RS entirely, and then I quickly realized that it fit with a lot of other things I had learned independently and could potentially explain a lot.
One of the things that improved for me was my fasting blood glucose, which I think you reported was above-average in your case as well. Somewhere around 100 mg/dl I think? Have you seen a report of any society having an avg FBG that high? If not, doesn't it strike you as a bit odd to assume that a high FBG should just be ignored, like VLC diet gurus suggest we should do? Even if physiological insulin resistance is not a problem in itself, it may suggest that something is not quite right--such as perhaps that the gut bacteria are not being properly fed.
Another indicator that your gut bacteria may be depleted is your low fecal volume. This may be a bad sign, rather than a good sign, as some VLCers have assumed. In other words, you may already have problems, and some of them may be hidden, and your physician does not even know what to look for, because physicians have never had to deal with people on extreme VLC diets before (even Dr. Atkins allowed some increased carb intake after his induction phase).
Resistant starch is not a recent fad, removing it from the diet is. The question isn't so much why add it back in, as why did we remove it in the first place. It seems to be one of the biggest holes in popular versions of "Paleo" diets. It and other prebiotics have been part of the human diet from the beginning. It's only since industrialization that it has been drastically reduced in the diet, especially in the USA recently.
One of the puzzles for VLCers was why multiple high-starch societies are faring so well, such as the Kitavans and Okinawans. The usual excuse is to blame it on exercise, but RS may be a better explanation.
In the past, the key component of "fiber" was thought to be the bran/husk of plants. Then when this was studied, it turned out that bran did more harm than good and scientists were perplexed. Some of them went back to the drawing board and re-examined the diets of healthy populations with high fiber intakes and discovered that it wasn't so much bran that they were eating as resistant starch.
Lots of people talk about the right diet for them, but few talk about the right diet for their beneficial gut bacteria, which is proving to be also quite important.
One fellow is looking into the possibility that liver and other organs may provide some of the benefit of RS, so if you don't expand your diet, then here's to hoping that your organ intake will be sufficient.
If you choose not to expand your diet at all, your gut microbiome results would still be particularly interesting. Maybe your physician would even prescribe the test, as it seemed like in the past he was worried about your diet (though perhaps less so since your colonoscopy).
Another change that has happened since the early days of your VLC experiment is that more and more VLCers have been reporting worse and worse problems. One whistle-blowing ex-VLC physician recently reported that things have gotten so bad, he is afraid of being sued for his past advice to eat VLC, and thus he wishes to remain anonymous. According to him, by the time people realize that there is a problem, it may be too late to save themselves.
There has also been more and more evidence coming out of higher starch consumption by Neanderthals, ancient H. sapiens sapiens, Eskimos and others than previously assumed. The completely novel modern VLC dietary approach is turning out to be more problematic and more rare than many expected, including me.