Myth: You need to wait an hour after eating to swim or you can cramp and drown.

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Reality: Many sources say there are no documented cases of anyone ever drowning because they’ve had a cramp related to swimming with a full stomach. Cramps do happen frequently when swimming, but they aren’t caused by what’s in your stomach. If you do get one, the best policy is to float for a minute and let it pass. 

Source: https://www.businessinsider.com/worst-science-health-myths-2016-1?IR=T#myth-you-need-to-wait-an-hour-after-eating-to-swim-or-you-can-cramp-and-drown-66 

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