9. No swimming!
Another enduring old myth states that it is dangerous to go swimming any sooner than an hour after eating, since it may result in cramps. The only real “cramp” is the person who was silly enough to start this myth many years ago and pass it along as truth. There is no increased danger whatsoever by swimming immediately after eating. If you are prone to seasickness, you may throw up, but that is something the local fish population would probably appreciate. I just made that last part up.