this post was submitted on 27 May 2025
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is not made up, reading this Wikipedia entry parents would say "better safe than sorry"
https://en.m.wikipedia.org/wiki/Cold_shock_response
Edit, add another more complete source https://wpool.fr/en/blog/temperatures-eau-piscine/choc-thermique/qcq-hydrocution/
And what does that have to do with swimming after eating?
I added another source that relates alcohol and copious meal.
I'm not convinced that source isn't just spreading the urban myth. You're going to have to come with something with more weight behind it than the webpage of a seller of heatpumps. Here's another source saying it has nothing to do with eating: https://www.la-tour.ch/fr/conseils/se-baigner-apres-manger-faut-il-vraiment-attendre-3-heures
That's for very cold water or very large temp difference. As a rule, if it's summer, splash some water on you first and go feet first, never head first.
It is about the difference of temperature, so, being under the sun for long time makes it more risky, even if the water is not so cold.
I added another link that maybe explains it better.
What you mention is also important, "entering water slowly..."