First of all, my apologies for the long time between posts now. I’m a bit busy lately and have been preoccupied with other things. Also, I haven’t come across anything particularly interesting lately that feels like I can do a relatively short post on it.

I was reminded of this one by a post on ScienceAlert. As I am lazy right now, I’ll just sum up the point. I’m sure most of my readers now trust me enough to not need references. If you must have references before believing me, feel free to Google them.

Basically, there’s an old myth that you shouldn’t go swimming until 30 minutes after eating. This has been a pretty persistent myth despite no health organisations actually backing it (The Royal Lifesaving Association, Academy of Pediatrics, US Consumer Product Safety Commission and American Red Cross say nothing about swimming after eating). Nevertheless, the power of ignorance to propagate is astounding and many people stick to this one as if it were fact.

But let’s take a look deeper, shall we? Why shouldn’t we swim until at least 30 minutes after? Well, here’s where opinions begin to differ (one tell-tale sign of an unscientific “fact”). Some claim that it causes vomiting, others that it can cause cramps, and more still that the stomach’s act of digesting food redirects blood flow from your limbs, potentially causing you to drown. The truth? None of these are on the mark, though like all good myths they have a tiny kernel of truth. Yes, digestion does redirect blood flow, but not nearly enough to cause the kind of paralysis that would lead to drowning. Imagine if that were true. And this can contribute to cramps, but there are many other factors that are a much stronger factor on cramps, such as muscle fatigue.

Now some of you might be going “But I do vomit when I swim after eating! Therefore you, sir, are incorrect!” Let me remind you that an argument from personal experience is an anecdotal fallacy. It is, quite simply, wrong to argue with it. I should add though, if you’re susceptible to vomiting after eating, you probably ate too much in one go. Those that have read my nutrition posts or know anything about the glycemic index and/or insulin response mechanism by your body to food should know that it’s bad for you to eat large amounts in one sitting (with some exceptions).