I Knew Our Parents Were Lying! (page 6)
Swimming after eating causes cramps
This is a tale that has been shared on countless occasions, with the idea that eating diverts blood away from the muscles to the stomach, thereby increasing the chances of cramps and drowning. The motive is clearly to save lives, but the logic is fundamentally flawed. Cramps are often caused by muscle fatigue, dehydration and other factors, such as lack of sodium. However, none of these factors have any correlation to eating just prior to exercise, and in some cases, it could even be argued that replenishing your energy while exercising could actually reduce the risk of cramping.