Then, inconceivably, torrential rains came again in 1316. The grain crop failed a third year in a row. Europe began to experience the worst famine in its history. When other sources of food ran out, people began to eat one another. Peasant families consumed the bodies of the dead. Corpses were dug up from their burying grounds and eaten. In jail the convicts ceased to be fed; we are told that starving inmates "ferociously attacked new prisoners and devoured them half alive." Condemned criminals were cut down from the gallows, butchered, and eaten. Parents killed their children for food, and children murdered their parents.
From Hungry Ghosts: Mao's Secret Famine, by Jasper Becker:
There are enough reports from different parts of the country to make it clear that the practice of cannibalism was not restricted to any one region, class or nationality. Peasants not only ate the flesh of the dead, they also sold it, and they killed and ate children, both their own and those of others. Given the dimensions of the famine, it is quite conceivable that cannibalism was practised on a scale unprecedented in the history of the twentieth century.
From the report of the United States Congress Commission on the Ukrainian Famine, reported in Becker, above:
Very frequent is the phenomenon of hallucination in which people see their children only as animals, kill them and eat them. Later, some, having recuperated with proper food, do not remember wanting to eat their children and deny even being able to think of such a thing. The phenomenon in question is the result of a lack of vitamins and would prove to be a very interesting study, alas one which is banned even from consideration from a scientific point of view.