Foie gras production involves force-feeding ducks and geese to massively enlarge their livers, causing suffering that has led to bans in over 20 countries.
Force-fed birds in foie gras production experience esophageal trauma, hepatic lipidosis causing organ dysfunction, and severe mobility impairment. The degree of suffering is documented in veterinary literature and has been sufficient to trigger bans in countries with strong animal welfare frameworks.