 After comprehensive analysis of how early texts describe "grain" (i.e., "mainstream food") avoidance, from the (c. 320 BCE) Zhuangzi to the (c. 320 CE) Baopuzi, Campany (2005:43) concludes the (c. 280 CE) Lingbao wufu jing is the earliest passage "in which grains are attacked as a food source based on what we might call negative internalist reasons—that is, on the grounds that they cause actual harm to the body in specific, theorized ways."
<clarity>  After comprehensive analysis of how early texts describe "grain" (i.e., "mainstream food") avoidance, from the (c. 320 BCE) Zhuangzi to the (c. 320 CE) Baopuzi, Campany (2005:43) concludes the (c. 280 CE) Lingbao wufu jing is the earliest passage "in which grains are attacked as a food source based on what we might call negative internalist reasons—that is, on the grounds that they cause actual harm to the body in specific, theorized ways."
 After comprehensive analysis of how early texts describe "grain" (i.e., "mainstream food") avoidance, from the (c. 320 BCE) Zhuangzi to the (c. 320 CE) Baopuzi, Campany concludes the (c. 280 CE) Lingbao wufu jing is the earliest passage "in which grains are attacked as a food source based on what we might call negative internalist reasons—that is, on the grounds that they cause actual harm to the body in specific, theorized ways."