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.
The other thing is that chapter lengths are important if you want to keep your book on the straight and narrow, otherwise you'll end up with a tome thicker than a tectonic plate and busting 800,000 words. This is why writers vary chapter length, so they can keep within the 80K, 90K or 100K words of the average novel.