‘Don’t swim after eating or you’ll get stomach cramps and drown.’
‘Wait an hour after eating before swimming’.
These and more are part of the common folklore, repeated ad nauseam to children in summer as they holiday by the beach. So the kids fidget and annoy each other before finally being allowed to swim again after what seems like an eternity. We have it from parents, teachers, and pretty much everyone.
It’s complete rubbish. You may as well say, don’t ride your bicycle after eating, or don’t run after eating, or don’t do anything energetic after eating. You might get a stomach cramp and crash your bike, trip over, or some other dire outcome. Actually, it is much like the myth of the common cold – that if you get a chill you might catch a cold. Like that myth, this one too is usually impervious to facts.
As for me, I have swum plenty of times on a full stomach. Not even a twitch in my gut when I do so.