Factory farm animals, locked in extreme confinement, suffer some of the worst cruelty imaginable. Egg-laying hens are confined in cages so small they can’t even flap their wings. Mother pigs in the pork industry are locked in metal “gestation crates,” which prohibit them from turning around for...

Sometimes my most significant revelations are the annoying, kick-me-in-the-pants ones that follow a period of contented denial. One of those seismic shifts in thought came last year at a dinner party, when a man nearly half my age honed in on a flaw in logic I’d subconsciously buried. A plant...