Mary Roach, dubbed by the Washington Post as "America's funniest science writer" has done it again. In her latest book, 'Gulp: adventures on the alimentary canal, she takes the reader on a mysterious adventure exploring all the nooks and crannies of the alimentary tract... all 30 feet of it. Starting with the nose (sniff, sniff) to, yes you guessed it, the 'ick factor' including the 'perfumed' part on the way. So much for a spoiler alert!
And if you enjoy this book, you may want to check out the many other hilarious titles by Mary Roach - Toronto Public Library has many copies in various formats including e-books.
If humour isn't your thing and you would rather read something more serious on the digestive system, here are further suggestions.