Can You Swim After Consuming?

There are a number of commonalities throughout childhood swimming experiences in the US that I’d enterprise to guess you is perhaps aware of. Did you ever play Marco Polo? Maybe you rode round on foam pool noodles with your mates? Did you drink Capri Suns and snack on Cheetos Puffs across the perimeter of the water as I did? 

Even when not one of the above rings true for you, I’m virtually sure you’ve heard of the broadly accepted pool knowledge that many dad and mom share with their children: Don’t swim for no less than half-hour (or generally an hour, relying on which grownup you are asking) after you’ve eaten.

I heard this previous adage all through my childhood, and like many others, I’ve lengthy accepted it as true. However once you replicate on this “truth” for a minute or two, it raises the query: Why can’t you swim for no less than half-hour after consuming? In a latest episode of the podcast ScienceStuff, host and former roboticist Jorge Cham takes listeners on a deep dive into this doable fantasy, exploring what it means precisely, if there’s any diploma of fact to it, and whether or not we will begin consuming extra snacks proper earlier than we hop within the pool.

The place did this fantasy come from?

Even the supply of this age-old knowledge is considerably shrouded in thriller. Cham explains that neither he nor anybody he consulted may definitively decide the place the advice to attend half-hour earlier than swimming originated. Nevertheless, the earliest documented point out of this recommendation that he can discover comes from a considerably surprising supply: the unique Boy Scout guide from 1908, Scouting for Boys by Robert Baden-Powell. 

This guide — which was wildly in style within the early twentieth century — affords a variety of recommendation, from sensible abilities resembling how you can use a compass to knowledge that doesn’t endure, like climate predictions resembling “a yellow sundown means wind.”

The latter is unsurprising, contemplating this can be a textual content from over 100 years in the past. But, hidden inside its pages is a bit of counsel that’s nonetheless handed on right this moment: “By no means bathe in deep water very quickly after a meal, it is vitally prone to trigger cramp, which doubles you up, and so that you get drowned.” And right here is the place the 30-minute fantasy begins — no less than to the most effective of our data.

Is swimming after consuming harmful?

Because the language on this archival Boy Scout guide signifies, the “rule” that you simply shouldn’t swim for no less than half-hour after consuming arises from a worry that doing so may result in a cramp extreme sufficient to trigger drowning.

To find out whether or not this concern is justified, Cham consults a great supply: Dr. Matthew Badgett, a doctor specializing in inner medication and pediatric main care on the Cleveland Clinic, who additionally occurred to be a aggressive swimmer in highschool. (Badgett has additionally spoken in regards to the relationship between swimming and consuming earlier than.)

To start out, Badgett highlights the contradiction in dad and mom advising kids towards consuming proper earlier than swimming, whereas concurrently encouraging them to eat and drink simply earlier than different actions — resembling soccer — to stop cramps.

Recalling his personal childhood, he says, “I at all times had a robust barometer for hypocrisy, however I at all times thought this rule actually made no sense to me.” He additionally notes that “I may bodily inform the distinction if I had two items of toast after which went and swam an hour at 5:30, 6 a.m. in highschool, versus if I did not eat it, I might be dragging.”

General, the physician emphasizes that for strenuous actions resembling biking and working, you want energy to gasoline your physique; this additionally applies to aggressive swimming.

Though most individuals aren’t exercising vigorously whereas swimming in a pool, Badgett explains that in his pediatric coaching, he by no means realized something indicating whether or not you must or shouldn’t eat earlier than swimming in any state of affairs. He has additionally by no means had a father or mother strategy him with a difficulty brought on by their baby consuming shortly after swimming.

Along with Badgett’s expertise as a physician and his logical argument towards the archaic rule towards consuming and swimming, Cham additionally examines printed scientific proof confirming that there’s nothing to fret about.

In 2011, the American Pink Cross Scientific Advisory Committee (SAC)  printed a complete evaluate of present research on the results of consuming earlier than swimming. It in the end concluded that, “Presently accessible data means that consuming earlier than swimming isn’t a contributing danger for drowning and may be dismissed as a fantasy.”

Much more importantly, the American Pink Cross has printed steerage as just lately as 2024 stating that “Swimming inside one hour of consuming meals in grownup and baby leisure or aggressive swimmers doesn’t enhance the danger of drowning.” 

Can swimming after consuming make you’re feeling sick?

Whereas proof exhibits there’s no inherent hazard in swimming quickly after consuming, there stays the chance that it may trigger nausea or discomfort. The truth is, Cham notes that a number of research reviewed by the SAC discovered “that the swimmers who went swimming [in] thirty minutes or much less reported a big quantity of discomfort and nausea. It was not swimming expertise for them.”

To grasp why this happens requires a quick biology lesson. Dr. Stephen Ives, an affiliate professor of well being and human physiological sciences at Skidmore Faculty, explains that once you’re at relaxation, your coronary heart pumps the suitable quantity of blood to all of the techniques in your physique based mostly on their wants.

This contains your digestive system, and Ives particulars that “Your mind’s getting what’s wanted, the center’s getting what it wants, the muscle tissue are getting some, the intestine is getting what it wants.”

Whenever you train, your cardiac output — the quantity of blood your coronary heart pumps per minute — will increase. On the identical time, the precedence of blood circulation to totally different bodily techniques shifts, as sure areas require vitamins, power, and oxygen from the blood whilst you exert your self. “There is a excessive demand for blood circulation, for the vitamins, for the oxygen to help power manufacturing so the muscle tissue can maintain doing their factor and contracting.

“That may come at [the] value of a number of the different organs. So on a proportion foundation, the intestine goes from getting possibly 25% of the blood that is pumped out by the center per minute to possibly a pair %. It will get reduce dramatically,” Ives explains.

This implies your digestive course of will probably be slower. When you’ve simply eaten a really giant and calorically dense meal — or one thing excessive in fats, which may be tougher to digest — it would sit in your abdomen for longer and trigger discomfort. You may think about this as a sensation similar to when you went for a run proper after a giant meal. You possibly can do it and be advantageous, however your abdomen would possibly really feel a bit of unsettled.

However blood circulation isn’t the one issue contributing to doable gradual digestion whereas swimming. Ives factors out that gastric emptying, the method of meals transferring out of your abdomen to your small gut, happens extra rapidly once you’re standing or sitting upright in comparison with mendacity down. Whenever you swim, you’re technically horizontal, which may additionally result in slower digestion and discomfort.

Ives factors out {that a} frequent reason behind muscle cramps is a scarcity of electrolytes, which may be obtained from meals like bananas, spinach, milk, dill pickles, and lots of others. If it has been too lengthy because you consumed supply of electrolytes, it may result in cramps whereas swimming. Cham summarizes this by saying, “It seems like you do not need to eat too near swimming, however you do need to eat one thing beforehand in some unspecified time in the future,” to make sure you have gasoline and electrolytes.

What does this imply for you?

In line with the Pink Cross’ steerage, you needn’t fear about any severe hazard from consuming inside half-hour of swimming. As Ives concludes, “It is probably not a security situation. I might say under-nutrition might be extra of a security situation. It is extra of a consolation situation.”

You may positively swim proper after consuming, however when you’ve had a big meal, it is perhaps smart to attend for about half-hour to keep away from feeling nauseous. When you’ve solely had a lightweight snack, you probably don’t want to fret in any respect, which is nice information for these of us who love snacking and swimming.