If you grew up in the U.S., chances are you were told some version of this poolside rule: “Wait 30 minutes after eating before swimming—or you’ll get a cramp and drown.” It’s one of those childhood warnings that stuck, even though most of us never questioned it. But is it actually true?
Spoiler: Nope, it’s a myth.
This old rule traces back to a 1908 Boy Scout manual that warned against swimming after eating due to the risk of stomach cramps. However, modern science doesn’t support that. In fact, the American Red Cross has reviewed the research and confirmed: eating before swimming does not increase the risk of drowning.
So why the confusion? While it’s not dangerous, swimming after a big meal might make you feel uncomfortable. That’s because digestion redirects blood flow to your gut, while exercise pulls blood toward your muscles. The result? A little sluggishness, maybe some nausea, but nothing life-threatening.
Experts say if you’ve had a large, fatty meal, waiting 20–30 minutes might help you avoid discomfort. But if it’s just a snack? You’re probably good to go.
Dr. Stephen Ives from Skidmore College notes that swimming horizontally may slightly slow digestion compared to standing or sitting, but again, the issue is comfort, not safety.
