Let's say you're going swimming at the beach or pool, when suddenly, hunger strikes. After eating, you jump into the water, but experience a stomach or muscle cramp, causing you to struggle to stay afloat. If you're really unlucky, you might drown.
Looks like you should have waited at least 30 minutes or an hour after eating!
This is an old wives' tale that has long been debunked. While swimming cramps are not rare, and stomach cramps caused by the direction of oxygen away from the stomach muscles are debatable, there have been no reported cases of drownings or near-drownings from them. Why the stomach would be so sensitive to post-meal cramps when you're swimming, yet fail to suffer them if you're exercising out of the water, is never explained.
The best thing to do in the event of a cramp suffered while swimming is to relax and tense the affected muscle, or stay afloat until help arrives. Otherwise, feel free to satisfy your cravings by the water.
- A Slim Jim commercial featured a man eating the product, then jumping into the pool. The personification of the Slim Jim (now in his stomach) tells the swimmer that he should have waited it out, causing both to suffer the consequences.
- Lampshaded in Ice Age 4: Continental Drift, where Sid begs a kangaroo not to throw him overboard since he had to wait an hour before swimming since he ate recently.
Sid: What, you want me to walk into the water? I can't because I ate less than twenty minutes ago and you know the rule!Raz: (Crossly) That's a myth!Sid: (Uneasily) Oh, okay... as long as it's safe.
- Big Hero 6 has Baymax keep Hiro from falling into the water for no other reason than the fact that he ate recently.
- In The Princess Bride, Miracle Max and his wife Valerie warn Indigo not to let Westley go swimming for an hour after he takes the ressurecting pill of life. Never mind that he's mostly paralyzed for the rest of the day.
- In A Series of Unfortunate Events, Aunt Josephine tells the Baudelaries that they must wait one hour after eating before swimming in Lake Lachrymose. Klaus initially assumes it's because of cramps, but Josephine informs him that it's actually because of the lake's carnivorous leeches.
- A Tale of Time City: Jonathan and Sam's parents hold them to this during the picnic at the lake.
- Desperation: While visiting the land of the dead in a trance, David learns that reverend Martin (a priest from his home town, whom David became close to since his conversion to Christianity) drowned two days after the Carver family left on their holiday because he went swimming too soon after lunch and went too far out into the sea.
- Adam and Jamie on MythBusters debunked this, as well.
- Penn & Teller: Bullshit! had a go at this as part of an episode on overblown reaction to child dangers. They exposed a "lab rat" six-year-old kid to various old wives' tales in order to debunk them, the "wait 30 minutes after eating" myth among them by having him eat a sandwich and immediately go swimming afterwards. Obviously, the kid was fine.
- An episode of Small Wonder had Ted stage his own drowning by cramps to get rid of his Nosy Neighbor's alleged life debt.
- Exaggerated in a The State sketch. Someone at a barbecue goes swimming and gets a cramp. One after another, everyone at the party jumps in to save the drowning people and gets a cramp.
- In an episode of The Big Bang Theory, a character mistakenly thinks this applies to having sex after eating.
- The Far Side had a young snake with a large lump in his belly attempt to go swimming at the beach. His mother tells him to wait a whole week before going in.
- On Tiny Toon Adventures, Calamity Coyote works as a lifeguard at a pool. After he sees Hamton eat something and try to get in, Calamity warns him (with a sign) to wait 30 minutes. Hamton shrugs it off, and as soon as he dips his toe in the pool, he gets cramps all over and falls in.
- In the Goofy cartoon "How to Swim", Goofy's changing cabin falls into the water while he's inside and ends up walking out, setting up a picnic area and eating a full meal without being aware that he's underwater. The narrator points out the rule of waiting before eating and warning about cramps, which appear as knots all over Goofy's limbs and body.
- In one Magnificent Muttley segment Dastardly orders Muttley to clean the pool since he wants to go swimming after lunch. He never gets into the water though as he gets bounced repeatedly between the two-level diving board.
- In the Fairly OddParents episode "Which Witch is Which?", Timmy uses this as an excuse to try and get out of being thrown into a lake to see if he's a witch. It doesn't work.
- On the Phineas and Ferb episode "The Lake Nose Monster", the captain of the titular lake decides to go for a swim after eating a hot wing, saying that this old wives' tale was just a hoax and they keep it alive so they could sell snowglobes of a kid getting a cramp. He steps into the water and gets a cramp just as Phineas, Ferb, Perry, and Lawrence in the Nosebud are about to hit him.
- Discussed in an episode of Ed, Edd n Eddy. In "Stop, Look, and Ed", Eddy invites the kids for an after-dinner swim as part of a campaign to abuse alone time from the parents. Jimmy fears getting cramps from doing so, but Eddy reassures him that "that's what grown-ups want you to think".
- The Grim Adventures of Billy & Mandy: The episode "Billy Ocean" has Billy eating a crab named Ziggy (an expy of Sebastian) and, a minute later, suffers a stomach cramp.
Billy: I shouldn't have gone swimming after I just ate.Ziggy: (from inside Billy's stomach) Serves you right, mon!
- Exploited in the Spongebob Squarepants episode "SpongeGuard on Duty", where SpongeBob, being a substitute lifeguard who can't swim, finds a way to not go into Goo Lagoon by having people come out of the lagoon to get free ice cream, then reminding them that they have to wait an hour to go back in after eating. And to make absolutely sure they don't go in, he wraps everyone up in police tape.
- In this same episode, it gets subverted when a guy almost drowns trying to read and swim!