Once the roots of the Eskimo potato got too tough to eat, Christopher McCandless started collecting the seeds in a plastic bag, says author Jon Krakauer. Photo courtesy of McCandless family hide caption toggle caption Photo courtesy of McCandless family The Salt 'Into The Wild' Author Tries Science To Solve Toxic Seed Mystery May 1, 2015 Jon Krakauer has long been haunted by how Christopher McCandless died in the Alaskan wilderness. In a scientific journal, he and a chemist show that the seeds McCandless consumed can contain a toxin.