Thanks, very interesting blog.

Finally a decent explanation for why people with AS have higher prevalence of H Pylori infection. I first read about the hydrogen -> H Pylori link from Stephen Guyenet's blog -
"Excessive fructose, certain types of fiber, and wheat cause bacterial overgrowth and H2 production... Resistant starch, as well as certain non-caloric sweeteners, are readily fermented into H2 in some people... "
http://wholehealthsource.blogspot.com/2009/02/sugar-hydrogen-bacteria-and.html

What I didn't realise was until I read your link was that Kleb's turn starch into hydrogen.
"Helicobacter pylori feeds on hydrogen gas produced by Klebsiella pneumoniae in gut biofilms... Klebsiella pneumonia is a lung pathogen and it also forms gut biofilms. Presence in the gut and the ability to produce hydrogen gas has some implications for hydrogen utilizing bacteria like H. pylori. Clearly, the stomach of someone with an abundant source of hydrogen fuel in their blood is a better target for H. pylori colonization."

If the starch -> kleb link is what is behind AS then the
starch -> kleb -> hydrogen -> H Pylori link would explain why people with AS have increased prevalence of H Pylori. The pieces seem to fit.