In historical accounts of retroactively diagnosed wendigo psychosis, it has been reported that humans became possessed by the wendigo spirit, after being in a situation of needing food and having no other choice besides cannibalism. In 1661,
The Jesuit Relations reported: {{Verse translation|Ce qui nous mit plus en peine, fut la nouvelle que nous apprismes dés l'entrée du Lac, à sçauoir : que les deputez par nostre Conducteur, qui deuoient conuoquer les Nations à la Mer du Nord, et leur donner le rendez-vous pour nous y attendre, auoient esté tuez l'Hiuer passé, d'une façon estonnante. Ces pauures gens furent saisis, à ce qu'on nous a dit, d'vn mal qui nous est inconnu, mais qui n'est pas bien extraordinaire parmy les peuples que nous cherchons : ils ne sont ny lunatiques, ny hypocondriaques, ny phrenetiques; mais ils ont vn mélange de toutes ces sortes de maladies, qui, leur blessant l'imagination, leur cause vne faim plus que canine, et les rend si affamez de chair humaine, qu'ils se iettent sur les femmes, sur les enfans, mesme sur les hommes, comme de vrais loups-garous, et les deuorent à belles dents, sans se pouuoir rassasier ny saouler, cherchans tousiours nouuelle proye, et plus auidement que plus ils en ont mangé. C'est la maladie dont ces députez furent atteints; et comme la mort est l'vnique remede parmy ces bonnes gens, pour arrester ces meurtres, ils ont esté massacrez pour arrester le cours de leur manie. Although in many recorded cases of wendigo psychosis the individual has been killed to prevent cannibalism from resulting, some Cree folklore recommends treatment by ingestion of fatty animal meats or drinking animal grease; those treated may sometimes vomit ice as part of the curing process. One of the more famous cases of wendigo psychosis reported involved a
Plains Cree trapper from
Alberta, named Swift Runner. During the winter of 1878, Swift Runner and his family were starving, and his eldest son died. Twenty-five miles away from emergency food supplies at a
Hudson's Bay Company post, Swift Runner butchered and ate his wife and five remaining children. Given that he resorted to cannibalism so near to food supplies, and that he killed and consumed the remains of all those present, it was revealed that Swift Runner's was not a case of pure cannibalism as a last resort to avoid starvation, but rather of a man with wendigo psychosis. Another well-known case involving wendigo psychosis is that of
Jack Fiddler, an
Oji-Cree chief and
medicine man known for his powers at defeating wendigos. In some cases, this entailed killing people with wendigo psychosis. As a result, in 1907, Fiddler and his brother Joseph were arrested by the Canadian authorities for homicide. Jack committed suicide, but Joseph was tried and sentenced to life in prison. He ultimately was granted a pardon but died three days later in jail before receiving the news of this pardon. Fascination with wendigo psychosis among Western
ethnographers,
psychologists, and
anthropologists led to a hotly debated controversy in the 1980s over the
historicity of this phenomenon. Some researchers argued that, essentially, Wendigo psychosis was a fabrication, the result of naïve anthropologists taking stories related to them at face value without observation. Others cited several credible eyewitness accounts by Algonquians and others, as evidence that wendigo psychosis was a factual historical phenomenon. The frequency of wendigo psychosis cases decreased sharply in the 20th century as
Boreal Algonquian people came into greater and greater contact with European ideologies and more sedentary, less rural, lifestyles. The 10th revision of the
International Statistical Classification of Diseases and Related Health Problems (ICD) classifies "Windigo" as a
culture-specific disorder, describing it as "Rare, historic accounts of cannibalistic obsession... Symptoms included depression, homicidal or suicidal thoughts, and a delusional, compulsive wish to eat human flesh... Some controversial new studies question the syndrome's legitimacy, claiming cases were actually a product of hostile accusations invented to justify the victim's ostracism or execution." ==As a concept or metaphor==