Foie gras production involves force-feeding ducks and geese to enlarge their livers — a practice banned in many countries.
Force-feeding for foie gras causes documented harm: esophageal damage from repeated tube insertion, liver disease causing discomfort and breathing difficulty, and extreme stress from confinement. The practice takes a natural physiological process in migratory birds and induces a pathological version of it. Over 20 countries have banned production as incompatible with humane treatment.