According to Krakauer, a well-nourished person might consume the seeds and survive because the body can use its stores of glucose and amino acids to rid itself of the poison. Since McCandless lived on a diet of rice, lean meat, and wild plants and had less than 10% body fat when he died, Krakauer hypothesized that McCandless was likely unable to fend off the toxins. However, when the Eskimo potatoes from the area around the bus were later tested in a laboratory of the University of Alaska Fairbanks by Dr. Thomas Clausen, toxins were not found. Krakauer later modified his hypothesis, suggesting that mold of the variety Rhizoctonia leguminicola may have caused McCandless’s death. Rhizoctonia leguminicola is known to cause digestion problems in livestock, and may have aided McCandless’s impending starvation. Krakauer now hypothesizes that the bag in which Chris kept the potato seeds was damp and the seeds thus became moldy. If McCandless had eaten seeds that contained this mold, he could have became sick, and Krakauer suggests that he thus became unable to get out of bed and so starved. His basis for the mold hypothesis is a photograph that shows seeds in a bag. This theory was also proved false as no mold was found.
However, in 1997, it was determined by “Dr. Thomas Clausen–the biochemist at the University of Alaska, Fairbanks, who examined the wild potato plant (Hedysarum alpinum) for Jon Krakauer–concluded after exhaustive testing that no part of H. alpinum is toxic. Neither the roots nor the seeds. Accordingly, McCandless could not have poisoned himself in the way suggested by Krakauer in his 1996 book Into the Wild, and in every subsequent reprinting of the book over the next decade. Likewise, Dr. Clausen’s analysis of the wild sweet pea (Hedysarum mackenzii)–given as the cause of Chris’s death in the current Sean Penn film–has also turned up no toxic compounds, and there is not a single account in modern medical literature of anyone ever being poisoned by this species of plant. Moreover, Penn’s on-screen excerpt from the ethno-botany guide Chris was using, indicating otherwise, is a complete fiction, for all that this plant lore text actually states is that the wild sweet pea “is reported to be poisonous” (Tanaina Plantlore, Priscilla Russell Kari, p. 128). The rest of it is simply made up. And so, even if McCandless made a mistake of botany, something that even Krakauer claims is unlikely, he would not have been poisoned as it is portrayed in the Penn film.”
The film adaptation directed by Sean Penn was released in 2007 and stars Emile Hirsch as McCandless. The film emphasizes, and in some cases exaggerates, certain aspects of personal relationships that McCandless experienced, including his parents’ domestic conflicts and his own interaction with teenager Tracy Tatro, played by Kristen Stewart. Other interactions portrayed in the film, however, seem very accurate based on Krakauer’s research, including the characters of Jan Burres, played by Catherine Keener, and “Ronald Franz” (pseudonym), played by Hal Holbrook. The film’s depiction of McCandless’s death differs from the theory put forth by Krakauer in the later edition of the book. Penn controversially and falsely depicts McCandless confusing the seeds of H. alpinum with those of the claimed to be toxic H. mackenzii; whereas, Krakauer revised his theory and claimed that McCandless died because he had ingested seeds that were infected with a particular type of mold, which has yet to be proven by any scientific evidence.
McCandless’s story is also the subject of a 2007 documentary by Ron Lamothe named The Call of the Wild. In his study of McCandless’s death, Lamothe concludes that McCandless starved to death and was not poisoned by eating the seeds of the wild potato.
A survival show set in Alaska, entitled Out of the Wild, is inspired by the story.
The directors of the Christopher Johnson McCandless Memorial Foundation, Bille and Walt McCandless, are in the process of launching a new book about the story based on Chris McCandless’s hundreds of unseen pictures and journal entries. The book is titled Back to the Wild and will be released, along with a DVD, in early 2011. Jon Krakauer has also written a piece in the book’s introduction.


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