Michelle Allison in The Atlantic:
Knowing a thing means you don’t need to believe in it. Whatever can be known, or proven by logic or evidence, doesn’t need to be taken on faith. Certain details of nutrition and the physiology of eating are known and knowable: the fact that humans require certain nutrients; the fact that our bodies convert food into energy and then into new flesh (and back to energy again when needed). But there are bigger questions that don’t have definitive answers, like what is the best diet for all people? For me?
Nutrition is a young science that lies at the intersection of several complex disciplines—chemistry, biochemistry, physiology, microbiology, psychology—and though we are far from having figured it all out, we still have to eat to survive. When there are no guarantees or easy answers, every act of eating is something like a leap of faith.
Eating is the first magic ritual, an act that transmits life energy from one object to another, according to cultural anthropologist Ernest Becker in his posthumously published book Escape From Evil. All animals must feed on other life to sustain themselves, whether in the form of breastmilk, plants, or the corpses of other animals. The act of incorporation, of taking a once-living thing into your own body, is necessary for all animals’ existence. It is also disturbing and unsavory to think about, since it draws a direct connection between eating and death.
More here.