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.
Now you have your wordcount estimate, which is the standard way to talk about a book's length. Contemporary novels tend to go about 80-100k, fantasy gets to be a bit longer, while YA fiction tends to cap at 75k. If you have 200 words on every hand-written page, you'll have a half-novel of 40,000 words. I have a novella of 40k that measures 137 pages on a 6x9 paperback. (292 words per page.). Most fiction paperback books average about 250-350 words per page. The Hobbit is about 95,000 words. My paperback copy of The Hobbit is 303 pages, so with a bit of math we find it clocks 313.5 words a page. You can also get a feel for how type, margins, and dimensions change the page count by googling some of the well known titles on your shelf.