Cannibalism has recently been both practiced and fiercely condemned in several wars, especially in Liberia and Congo. Today, the Korowai are one of very few tribes still believed to eat human flesh as a cultural practice. It is also still known to be practiced as a ritual and in war in various Melanesian tribes. Historically, allegations of cannibalism were used by the colonial powers to justify the enslavement of what were seen as primitive peoples; cannibalism has been said to test the bounds of cultural relativism as it challenges anthropologists "to define what is or is not beyond the pale of acceptable human behavior".
Cannibalism was widespread in the past among humans throughout the world, continuing into the 19th century in some isolated South Pacific cultures; and, in a few cases in insular Melanesia, indigenous flesh-markets existed. Fiji was once known as the 'Cannibal Isles'. Cannibalism has been well documented around the world, from Fiji to the Amazon Basin to the Congo to Māori New Zealand. Neanderthals are believed to have practiced cannibalism, and they may have been eaten by modern humans.
Cannibalism has been occasionally practiced as a last resort by people suffering from famine. Occasionally it has occurred in modern times. A famous example is the crash of Uruguayan Air Force Flight 571, after which some survivors ate the bodies of dead passengers. Also, some mentally ill individuals obsess about eating others and actually do so, such as Jeffrey Dahmer and Albert Fish. There is a resistance to formally labelling cannibalism as a mental disorder.