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.
Four hundred pages is about a hundred thousand words. By the way, the first page of a chapter is estimated to have 250 words, and partial pages other than the first page are estimated to have 125 words. Section breaks (the visual breaks between the scenes in your story) are indicated using a centered number sign (#).