Some people are tempted to opt out of the modern industrial food system altogether. But doing so can put them at risk of the very diseases that were banished from the food supply decades ago.
Concerned about health, Ms. Tardiff, the California nurse, bought organic and less processed foods whenever possible. She decided to try raw milk, believing the unpasteurized product would supply helpful organisms.
Instead, she got a dose of an unhelpful germ: campylobacter, easily killed by pasteurization. The ensuing intestinal illness caused a debilitating nerve disease. Ms. Tardiff communicated by blinking for months, and still cannot stand or use her hands.
“This has been life-altering,” she said. “All I want to say is, ‘Be careful.’ ”