It's been almost a week since i ate The Salad of Doom, and my gut flora haven't perfectly recovered yet. A respected fellow blogger had a carb/protein fest, and it took her brain awhile to get back to normal again, even after reestablishing ketosis. Some people have one taste of a "trigger food" and they can't stop.
The aged or damaged body doesn't behave the same way as the bodies of the young, fit people who participate in a lot of the dietary trials. Only a simpleton would expect them to.
We seem to be finding that, although our bodies had managed to function on what they'd been accustomed to, once we put them on a regimen of a more optimal diet, there's no going back. A diet full of sugar or sugar-resulting foods wreaks its damage SO slowly and progressively that we don't notice it; reintroducing such foods when we have become accustomed to functioning without them produces havoc almost instantly -- like watching a flower wilt via time-lapse photography.
I've come to believe that the phenomenon we call "aging" is actually the result of slow-poisoning -- a carbohydrate-accelerated process of nutrient deficiency and accumulated organ damage. There's also the diminution of enzyme production; i can't put off writing about that much longer. In the presence of any imbalance, the body makes an adjustment, which alters another organ's function, which makes another adjustment, ad infinitum. It's like how carrying a heavy purse on one shoulder all the time makes every muscle group in the body change structure. The first day you tote that purse around you don't notice it, but after 30 years, you don't stand up straight anymore.
Once we, as adults over 27 (when enzyme use slows), drop our junk-foodstuff-chowing ways and eat what nature intended, the body starts performing better. It will only go back to these semi-foods kicking and screaming, as i've found out. Numerous times.