Well, great news gum swallowers - it doesn't. (Although it's still not recommended that you swallow it.)
"It is true that most of the components of bubblegum are not found in nature," gastroenterologist Robynne Chutkan told WebMD. "And as such we don't have the enzymes to break them down. But eventually gum does get through the intestine and into the colon, where it is mixed with stool and then excreted."
And that "eventually" doesn't mean seven years. At most it could take about three days, but likely will come out in one. It's not going to get stuck to your intestines or find all the other swallowed gum friends to combine into a giant throat-climbing wad.
Since gum offers no nutritional value, it's pretty pointless to swallow. Only the carbohydrates from the sugar are digestible. The rest are unnatural ingredients that your body can't do anything with. This is likely where the rumors about it staying in your body for so long come from.
So, yeah, swallowing gum won't kill you, but it makes your stomach work extra hard to digest something that gives you no value.
Amberlee is the content manager for FamilyShare.com and earned a degree in journalism. She creates beautiful things with her experience in writing, graphic design, photography, video and music. She loves her family, the outdoors, baby foxes and podcasts.