I am looking for information on the exact processes that occur when water is consumed on an empty stomach. Hopefully the information will help with a problem I have.
Is acid, gastrin, or anything else secreted?
How long will it take to empty into the intestines (ml/minute)?
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You stomach is not really empty, but is already full. When the water arrives it has to leave fairly quickly, starting within 5 minutes into the small intestine, and more or less all gone in half an hour.
I would assume that consuming water on an empty stomach could cause the stomach to release more HCL, due to the water causing the pH to rise. Chemoreceptors in the stomach detect the rise in pH and signal the production of more acid. Then since there is little solid mass to liquefy and there is little substrate to trigger specific gastric juices and enzymes (i.e. pepsin), it would start emptying into the small intestine pretty rapidly.