 All depended on white bread, pork, and potatoes.To the investigators these habits, particularly the spurning of plentiful, nutritious foods such as fish, seemed irrational.They argued "The illusion of an 'economic man,' searching out the most obscure foodstuffs from an unwilling Nature in the reasoned pursuit of complete fulfillment of his needs, must give way to the concept of a man conditioned by the preferences and prejudices of his neighbors, selecting only those foods sanctioned by the 'culture.'"