Gastroenteritis and Dehydration

The Leaky Bucket During a Storm

Imagine your body is a bucket that normally holds 9 liters of water a day—the gut lining is like the bucket's sealed bottom and sides, which slowly absorb water back into the blood (the surrounding ground). When a germ invades, it's like a storm that punctures holes in the bucket AND loosens the seal so water floods out the bottom faster than it can soak into the ground. The vomiting is like tipping the bucket over and pouring water out the top at the same time. Your sympathetic nervous system is like your body standing up and frantically tilting the remaining water toward your brain and heart (the most vital spots), making your heart pump faster and squeezing blood vessels to the skin—this keeps you alive temporarily, but if the storm doesn't stop and you don't pour new water in, the bucket empties and you collapse. The dehydration cascade is the bucket getting emptier and emptier, and shock is when the bucket is so dry that vital organs stop working.