Food guru Michael Pollan has picked up on the “we’re more bacteria than human” meme and written an long, impressive New York Times article about it. He doesn’t go so far as to bring up the theory that oil is actually the excrement of bacteria that live beneath the earth’s crust, not the decomposed organic matter from the surface, as suggested by Thomas Gold (and apparently some unnamed Russians). If Gould is right then humans not just city-suits for bacteria, but also a waste disposal system for bacteria. This idea led Reza Negarestani to obliquely postulate that global warming will actually function to make the surface of the earth hot enough for those particular bacteria to live on the surface of the earth as well. Which means we’re doing, like, triple duty for our bacterial masters.
No, Pollan doesn’t go into any of that weird shit. He’s more practical, writing instead about the role that bacteria has in our health. For example, obesity, heart disease and other health issues may depend on what kind of gut bacteria we’re carrying around. Of course this reminds me of the 90s gene craze (“the obesity gene,” the “addiction gene,” the “wearing white socks with dress shoes gene”) and the 00s neuroanatomy craze. The upside is that a bacteria-focused model of health is less fatalistic than the genetic or neuroanatomical models — you can change your bacteria, you can’t change your genes. But there’s plenty of room for woo and quackery and unfulfilled promises. That’s not lost on bacteria researchers. Pollan writes:
My first reaction to learning all this was to want to do something about it immediately, something to nurture the health of my microbiome. But most of the scientists I interviewed were reluctant to make practical recommendations; it’s too soon, they told me, we don’t know enough yet. Some of this hesitance reflects an understandable abundance of caution. The microbiome researchers don’t want to make the mistake of overpromising, as the genome researchers did. They are also concerned about feeding a gigantic bloom of prebiotic and probiotic quackery and rightly so: probiotics are already being hyped as the new panacea, even though it isn’t at all clear what these supposedly beneficial bacteria do for us or how they do what they do. There is some research suggesting that some probiotics may be effective in a number of ways: modulating the immune system; reducing allergic response; shortening the length and severity of colds in children; relieving diarrhea and irritable bowel symptoms; and improving the function of the epithelium. The problem is that, because the probiotic marketplace is largely unregulated, it’s impossible to know what, if anything, you’re getting when you buy a “probiotic” product. One study tested 14 commercial probiotics and found that only one contained the exact species stated on the label.
That didn’t stop Pollan from seeking out a little bit of practical advise, which mostly consists of: eat a variety of fiber sources, don’t load up too much on processed foods, relax a little about hygiene and eat pre-biotics like kimchi, sauerkraut and yogurt.