During the summer months, when long lunches and dips in the sea are common, the myth of digestion stopping after meals often resurfaces in conversation.
Cardiologist Dr Hugo Café explains what you really need to know.
For generations, many have heard the same firm warning: “You can't go into the water right after eating. Your digestion might stop and that’s dangerous.” This advice has been passed down from parents to children, becoming almost a “beach law” — but in truth, it’s a myth with no scientific basis.
Is swimming after eating dangerous?
Current medical evidence, based on studies from institutions such as the American Red Cross, the Mayo Clinic, and the International Life Saving Federation, confirms: swimming after a meal does not pose any significant risk.
It’s true that, after very heavy meals, one might experience discomfort or mild cramps — which are common during any physical effort after eating — but there is no proven link between swimming after eating and drowning or cardiorespiratory arrest.
The origin of this belief seems to date back to old recommendations, such as those found in early 20th-century scouting manuals, where a period of rest after eating was suggested. Over time, this precaution evolved into a prohibition without clinical basis.
The real risk lies elsewhere.
As previously discussed in the article “Thermal shock at the beach: A real but preventable risk,” it is this situation that deserves true medical attention.
Suddenly entering very cold water after prolonged sun exposure can trigger an intense physiological response — including respiratory and circulatory changes — which, in certain cases, can lead to fainting or cardiorespiratory arrest, particularly in individuals with pre-existing heart conditions.
The practical recommendations to prevent this situation, previously outlined in “Thermal Shock,” should continue to be followed rigorously.
Conclusion: digestion doesn’t “stop” because you go into the water. What can genuinely cause harm is entering cold water abruptly, without preparation and without regard for your physical condition.
It’s time to let go of myths and promote science-based information. Good preventive practices save lives — not the two-hour wait after lunch.
16, August 2025
