http://www.newsweek.com/id/57368/page/1

"That's the goal of the Human Microbiome Project, a five-year multinational
study that its advocates say could tell us almost as much about life as the
recently completed work of sequencing the human genome. One puzzling result
of the Human Genome Project was the paltry number of genes it found—about
20,000, which is only as many as it takes to make a fruit fly. Now some
researchers think some of the "missing" genes may be found in the teeming
populations of microbes we host."

So there is a hint as to how we differ from paleoman, and why paleofood
might affect us differently.

William