John Beadsman is a character in The Broom of the System.
Although it is debated in the novel whether or not he can be defined as anorexic, he rarely eats and weighs 90 or 100 pounds. John's dietary habits stem from his refusal to take part in the death of anything.
John is an academic in Chicago. In 1990 he has a seizure-like incident while taking a taxi to a lecture. He subsequently spends time in a mental hospital, and is not met by anyone when he leaves.