Eating is the most pleasurable gross necessary unspeakable biological process we humans undertake. But very few of us realise what strange wet miracles of science operate inside us after every meal. In her trademark style Mary Roach breaks bread with spit connoisseurs & enema exorcists stomach slugs rectum-examining prison guards & competitive hot dog eaters (how much can you eat before your guts burst?)- as she investigates the beginning & end of our food.