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I was always the kind of kid who put stuff in my mouth that didn't belong - wooden stacking blocks, my mom's car keys, the occasional earthworm. I loved the feel of a bit of sand in my sandwich, and I could never keep my teeth off my deliciously grimy fingernails. Now, as an adult, I rarely get sick, despite my predilection for taco trucks, Indian street food and pork products of dubious origin. Is there a connection?

In this week's New York Times health section, Jane Brody writes about what's known as the hygiene hypothesis - the theory that ingesting plenty of bacteria and viruses as a child can help develop a healthy immune system. Though no one disputes that public health measures like sewer systems and food production regulation have improved overall health immeasurably, studies have also shown higher rates of autoimmune disorders, allergies and asthma in people raised in ultra-clean environments. Basically, their systems don't "learn" to deal with foreign bodies, and become ultra-sensitive, attacking even normal tissue. Some research even suggests that deliberately infecting patients with worms can help treat certain auto-immune issues.

While most of us aren't going to go out and deliberately swallow pig whipworms, I think the hygiene hypothesis lends support to the increasingly widespread idea that it's OK to eat foods that fall outside the (supposedly) sterile confines of corporate agriculture. So let's all eat some raw milk cheese, cook some antibiotic-free meat, buy some gnobbly farmers market carrots with clods of earth still clinging to the tops. And maybe a little mud pie for dessert.

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