On twitter and tiktok over the past few weeks, scores of users have become alarmed about the uncomfortable coziness between the natural-food-and-body community and white-power and militant-right online spaces—the “crunchy-to-alt-right pipeline.” Crunchy, coined as a pop-culture reference to granola, has come to refer to a wide variety of cultural practices, including avoiding additives and food dyes, declining or spacing out childhood vaccinations beyond what pediatricians recommend, and more extreme actions in pursuit of health, independence, and purity. Back-to-the-land living and alternative medicine are hallmarks of “crunch.” Much of this subculture is benign, a declaration of anti-modernism or slow living. But...