Both anorexia and bulimia increase the risk of death. In the developed world binge eating disorder affects about 1.6% of women and 0.8% of men in a given year. Anorexia affects about 0.4% and bulimia affects about 1.3% of young women in a given year.
If you are insisting that on average a page is 500 words or 4,000 words the equivalent of 8 pages. By simple math you saying the average book is 80,000-120,000 words, would mean on average a novel is 160-240 pages. These would be classified as short novels or more so novels for older kids or younger teens.
An average novel length varies according to authors. Average length for Stephen King will be 500 to 700 pages, Dan Brown 400 to 600 pages, John Grisham 350 to 450 pages. Some novels like The Curious Incident of The Dog At Nigthtime was less than 200 pages long.